Explosions and gunfire have been heard in Watertown, about six miles from Boston city centre, after a police officer was shot dead at a university campus.
Officials from the FBI and the Homeland Security were seen in the area after a police officer at Massachusetts Institute of Technology suffered "multiple injuries" and died in hospital.
It is unclear whether the federal presence is linked the earlier bombings at the Boston Marathon earlier this week. However the Boston Globe quoted an unnamed official, saying that a suspect connected with the Boston Marathon bombings has been taken into custody.
Television footage showed one man sprawled on the ground, holding his arms up as police swarmed around him. A screen grab of a video obtained by CNN showed the man cuffed and naked as he was taken into custody.
NBC reported that explosives and a pressure cooker were found at the scene in Watertown. An official briefing on the Boston Marathon bombings earlier this week said the bombs were fashioned out of pressure cookers and packed with shards of metal, nails and ball bearings.
A bomb squad truck has also been pictured.
Police have not confirmed any link with the Boston bombings but said: "There is an active incident ongoing in Watertown. Residents in that area are advised to remain in their homes". Police are now going door to door.
There are reports a manhunt is underway after a man drove off at speed after the first arrest, according to witness accounts reported by Sky News. However the latest update on the MIT website said the campus was safe.
It read: "Police have determined that the suspect in this evening’s shooting is no longer on campus. It is now safe to resume normal activities. Please remain vigilant in the coming hours."
The latest reports come hours after the FBI released images of two suspects they are seeking in connection with the Boston Marathon explosions. Officers warned individuals not to approach the men, saying they believe them to be "extremely dangerous."
"Suspect 1" is wearing a dark hat, "Suspect 2" is wearing a white hat.
"They appear to be associated," FBI Special Agent Richard DesLaurier said. "Suspect 2" dropped a backpack at the site of the second explosion in front of the Forum restaurant and proceeded west, he added.
PHOTOS: (Story Continues Below)
Boston Marathon Bombing Suspects
Suspects 1 and 2(01 of36)
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This frame grab from a video released by the FBI on Thursday, April 18, 2013, shows what the FBI are calling suspect number 1, front, in black cap, and suspect number 2, in white cap, back right, walking near each other through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI) (credit:AP)
Suspects 1 and 2(03 of36)
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Suspect 1(04 of36)
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Suspect 1(05 of36)
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Suspect 1(06 of36)
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Suspect 2(07 of36)
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This image from video released Thursday, April 19, 2013 by the FBI shows one of two suspects sought in connection with the Boston Marathon bombings. (AP Photo/FBI) (credit:AP)
Suspect 2(09 of36)
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This combination of Associated Press file images released by the FBI on Thursday, April 18, 2013, show two images taken from surveillance video of what the FBI are calling suspect number 2, left, in white cap,and suspect number 1, right, in black cap, as they walk near each other through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI, File) (credit:AP)
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This frame grab from a video released by the FBI on Thursday, April 18, 2013, shows what the FBI are calling suspect number 1, black cap in lower right, walking in front of suspect number 2, not seen, through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI) (credit:AP)
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This frame grab from a video released by the FBI on Thursday, April 18, 2013, shows what the FBI are calling suspect number 1, black cap with backpack, walking in front of suspect number 2, white cap at lower right, through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI) (credit:AP)
Suspect 2(13 of36)
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This image from video released Thursday, April 18, 2013 by the FBI shows one of two suspects sought in connection with the Boston Marathon bombings. The FBI released photos and video of the two suspects and asked for the public's help in identifying them, zeroing in on the two men on surveillance-camera footage less than three days after the deadly attack. (AP Photo/FBI) (credit:AP)
Suspect 2, Hand Next To Ear(15 of36)
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This image from video released Thursday, April 18, 2013 by the FBI shows one of two suspects sought in connection with the Boston Marathon bombings. The FBI released photos and video of two suspects in the Boston Marathon bombing and asked for the public's help in identifying them, zeroing in on the two men on surveillance-camera footage less than three days after the deadly attack. (AP Photo/FBI) (credit:AP)
Suspect 2(17 of36)
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This image from video released Thursday, April 18, 2013 by the FBI shows one of two suspects sought in connection with the Boston Marathon bombings. The FBI released photos and video of two suspects in the Boston Marathon bombing and asked for the public's help in identifying them, zeroing in on the two men on surveillance-camera footage less than three days after the deadly attack. (AP Photo/FBI) (credit:AP)
Boston Marathon Explosions(19 of36)
This image provided by the Boston Regional Intelligence Center shows Dzhokhar A. Tsarnaev, one of the suspects in the Boston Marathon bombings. Authorities say Tsarnaev is still at large after he and another suspect both identified to The Associated Press as coming from the Russian region near Chechnya killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence into the early hours of Friday, April 19, 2013. The second suspect, who has not yet been identified, was killed in a shootout with police. (AP Photo/Boston Regional Intelligence Center) (credit:AP)
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This surveillance photo released via Twitter Friday, April 19, 2013 by the Boston Police Department shows a suspect entering a convenience store that police are pursuing in Watertown, Mass. Police say he is one of two suspects in the fatal shooting of an MIT police officer and tied to the Boston Marathon bombing. (AP Photo/Boston Police Department) (credit:AP)
MIT SHOOTINGS 2(21 of36)
Graphic shows photos of suspects; locates Watertown and Cambridge, Mass., where Boston Marathon bombing suspects exchanged gunfire and one is dead (credit:AP)
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This combo of photos released by the FBI early Friday April 19, 2013, shows what the FBI is calling suspects number 1, left, and suspect number 2, right, walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI) (credit:AP)
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This photo released by the FBI early Friday April 19, 2013, shows what the FBI is calling suspect number 1, walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI) (credit:AP)
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This photo released by the FBI early Friday April 19, 2013, shows what the FBI is calling suspect number 2, walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI) (credit:AP)
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This photo released by the FBI early Friday April 19, 2013, shows what the FBI is calling suspect number 2 behind a lady, walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI) (credit:AP)
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This photo released by the FBI early Friday April 19, 2013, shows what the FBI is calling the suspects together, walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI) (credit:AP)
BOSTON MARATHON(27 of36)
Graphic shows photos of the suspects and where they were caught on tape, a demographic profile of the runners and a map of the marathon path (credit:AP)
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Tamerlan Tsarnaev practices boxing at the Wai Kru Mixed Martial Arts center in April 2009 in Boston, Mass.These images show what is believed to be Boston bomber Tamerlan Tsarnaev boxing at the Wai Kru Mixed Martial Arts center in Boston, MA. The native Chechnya, dubbed Suspect 1 by the FBI, and has been reported as dead. He was described as a heavyweight fighter at the gym, and allegedly hoped to fight for the U.S., because his home nation was not recognised in the sporting world.
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Tamerlan Tsarnaev practices boxing at the Wai Kru Mixed Martial Arts center in April 2009 in Boston, Mass.
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Tamerlan Tsarnaev practices boxing at the Wai Kru Mixed Martial Arts center in April 2009 in Boston.
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Tamerlan Tsarnaev practices boxing at the Wai Kru Mixed Martial Arts center in April 2009 in Boston.
Tamerlan Tsarnaev(33 of36)
Tamerlan Tsarnaev practices boxing at the Wai Kru Mixed Martial Arts center in April 2009 in Boston.
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Tamerlan Tsarnaev practices boxing at the Wai Kru Mixed Martial Arts center in April 2009 in Boston.
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Tamerlan Tsarnaev practices boxing at the Wai Kru Mixed Martial Arts center in April 2009 in Boston.
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Tamerlan Tsarnaev
Speaking at an interfaith healing service earlier on Thursday, President Obama said: "We may be momentarily knocked off our feet, but we will pick ourselves up. We will keep going. We will finish the race," he told congregations at the Cathedral of the Holy Cross in Boston.
At the service, Mr Obama called the perpetrators of the attack "these small, stunted individuals who would destroy instead of build".
He has called the marathon bombings an act of terrorism.
His visit to Boston came after it emerged he was sent a letter apparently containing poisonous ricin.
There was no indication the letter, which was intercepted by the White House, was connected to the marathon bombings, the FBI said.
Nobody has claimed responsibility for the twin explosions which injured more than 180 people and killed eight-year-old Martin Richard, Krystle Campbell, 29, and a Chinese graduate student, named in reports as Lu Lingzi.
The bombs were made from ordinary kitchen pressure cookers packed with metal and ball bearings. Investigators suspect the devices were then hidden in duffel bags and left on the ground.
They exploded within 15 seconds of each other near the finishing line as thousands of runners were pouring in.
The Boston Marathon is one of the world's oldest and most prestigious with about 23,000 runners taking part, including hundreds from the UK and Ireland.
Police Search For Suspects In Watertown, Massachusetts, Following Reports Of Explosions
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A police officer signals for people to get back as they conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Matt Rourke) (credit:AP)
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Police run with their weapons drawn as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke) (credit:AP)
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Police cover as they surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Charles Krupa) (credit:AP)
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A neighbor is escorted to safety as police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Charles Krupa) (credit:AP)
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Police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Charles Krupa) (credit:AP)
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Police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Charles Krupa) (credit:AP)
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A man walks out of his home in a bath robe as police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday.(AP Photo/Charles Krupa) (credit:AP)
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Law enforcement officials stand guard while searching for an individual believed to be involved in the Boston Marathon explosions in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Julio Cortez) (credit:AP)
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Residents are seen near a window, top, as an official wearing tactical gear stands guard while searching for an individual believed to be involved in the Boston Marathon explosions in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez) (credit:AP)
Boston Marathon Explosions(10 of123)
A police officer points his weapon at a residence as he conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke) (credit:AP)
Boston Marathon Explosions(11 of123)
Police officers take cover as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke) (credit:AP)
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A barefooted woman runs for cover as police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Charles Krupa) (credit:AP)
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An official wearing tactical gear, left, looks on as others enter an apartment building in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez) (credit:AP)
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Heavily armed police continue to patrol the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as they continue a massive search for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle) (credit:AP)
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Tactical teams drive through a neighborhood while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Charles Krupa) (credit:AP)
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Officials wearing tactical gear search an apartment building in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez) (credit:AP)
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A police officer runs with his weapon drawn as he conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke) (credit:AP)
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Officials wearing tactical gear search an apartment building in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez) (credit:AP)
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Tactical teams drive through a neighborhood while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Charles Krupa) (credit:AP)
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An official wearing tactical gear, right, looks on as others enter an apartment building in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez) (credit:AP)
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Police run with their weapons drawn as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke) (credit:AP)
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Police officers take cover as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke) (credit:AP)
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A police officer runs with his weapon drawn as he conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke) (credit:AP)
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A police officer signals for people to get back as they conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Matt Rourke) (credit:AP)
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Tactical teams exit an apartment building while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Charles Krupa) (credit:AP)
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Heavily armed police enter a building in Watertown, Mass. Friday, April 19, 2013, as law enforcement officials continue a massive search for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle) (credit:AP)
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A police officer evacuates a shoeless man holding a child as members of law enforcement conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke) (credit:AP)
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A police officer runs with his weapon drawn as he conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Matt Rourke) (credit:AP)
Boston Marathon Explosions(29 of123)
A police officer points his weapon at a residence as he conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke) (credit:AP)
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Heavily armed police continue to patrol the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as they continue a massive search for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle) (credit:AP)
Boston Marathon Explosions(31 of123)
A police officer with is weapon drawn conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke) (credit:AP)
Boston Marathon Explosions(32 of123)
A police officer and a Federal Bureau of Investigation agent run as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke) (credit:AP)
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Officials wearing tactical gear stand near an armored vehicle as they search an apartment building for one of two suspects in the Boston Marathon bombing, in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez) (credit:AP)
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Investigators continue to search for one of two suspects in the Boston Marathon bombing, in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke) (credit:AP)
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Investigators continue to search for one of two suspects in the Boston Marathon bombing, in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke) (credit:AP)
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Members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter near the home of suspect #2 on Norfolk Street April 19, 2013 in Cambridge, Massachusetts. A Massachusetts Institute of Technology (MIT) campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. One suspect has been killed during the car chase and police are seeking another, believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)
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Residents are seen near a window, top, as an official wearing tactical gear stands guard while searching for an individual believed to be involved in the Boston Marathon explosions in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez)
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Residents and their pets are evacuated as members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter near the home of suspect #2 on Norfolk Street April 19, 2013 in Cambridge, Massachusetts. A Massachusetts Institute of Technology (MIT) campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. One suspect has been killed during the car chase and police are seeking another, believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)
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Police continue to patrol the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as a massive search continued for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle) (credit:AP)
Boston Marathon Explosions(40 of123)
Police presence grows in the neighborhoods of Watertown, Mass., Friday, April 19, 2013, as a massive search involving hundreds of heavily armed law enforcement officials continues for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Craig Ruttle) (credit:AP)
Boston Marathon Explosions(41 of123)
Police in tactical gear arrive on an armored police vehicle as they surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa) (credit:AP)
Boston Marathon Explosions(42 of123)
Police walk through a neighborhood in Watertown, Mass., while searching for a suspect in the Boston Marathon bombings, Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa) (credit:AP)
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A bus with law enforcement agents travels through Watertown, Mass., Friday, April 19, 2013. All residents of Boston were ordered to stay in their homes Friday morning as the search for the surviving suspect in the marathon bombings continued after a long night of violence that left another suspect dead. (AP Photo/Julio Cortez) (credit:AP)
Boston Marathon Explosions(44 of123)
A police officer in tactical gear conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Matt Rourke) (credit:AP)
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Police in tactical gear conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Matt Rourke) (credit:AP)
Boston Marathon Explosions(46 of123)
Police in tactical gear conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Matt Rourke) (credit:AP)
Boston Marathon Explosions(47 of123)
A Department of Homeland Security officer, right, prepares to enter an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa) (credit:AP)
Boston Marathon Explosions(48 of123)
With his weapon drawn, an official inspects an apartment building in Watertown, Mass., Friday, April 19, 2013. Dozens of officers and National Guard members are in Watertown, where gunfire and explosions were heard early Friday morning. (AP Photo/Julio Cortez) (credit:AP)
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Police in tactical gear conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. All residents of Boston were ordered to stay in their homes Friday morning as the search for the surviving suspect in the marathon bombings continued after a long night of violence that left another suspect dead. (AP Photo/Matt Rourke) (credit:AP)
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Residents look out a window as officials inspect an apartment building in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence that left one of them dead and another still at large Friday. (AP Photo/Julio Cortez) (credit:AP)
Boston Marathon Explosions(51 of123)
Police in tactical gear arrive on an armored police vehicle as they surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa) (credit:AP)
Boston Marathon Explosions(52 of123)
With his weapon drawn, an officer inspects dumpsters behind an apartment building in Watertown, Mass., Friday, April 19, 2013. Dozens of officers and National Guard members are in Watertown, where gunfire and explosions were heard early Friday morning. (AP Photo/Julio Cortez) (credit:AP)
Boston Marathon Explosions(53 of123)
Officials inspect vehicles in Watertown, Mass., Friday, April 19, 2013. Dozens of officers and National Guard members are in Watertown, where gunfire and explosions were heard early Friday morning. (AP Photo/Julio Cortez) (credit:AP)
Boston Marathon Explosions(54 of123)
Residents view police in tactical gear conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Matt Rourke) (credit:AP)
Boston Marathon Explosions(55 of123)
A police officer enters an apartment building with his dog while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa) (credit:AP)
Boston Marathon Explosions(56 of123)
Police secure a perimeter around an apartment building in a neighborhood in Watertown, Mass., while searching for a suspect in the Boston Marathon bombings, Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa) (credit:AP)
Boston Marathon Explosions(57 of123)
Police patrol through a neighborhood in Watertown, Mass., while searching for a suspect in the Boston Marathon bombings, Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa) (credit:AP)
Boston Marathon Explosions(58 of123)
Police walk through a neighborhood in Watertown, Mass., while searching for a suspect in the Boston Marathon bombings, Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa) (credit:AP)
Boston Marathon Explosions(59 of123)
A woman looks out a window at her home as police start to search an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Charles Krupa) (credit:AP)
Boston Marathon Explosions(60 of123)
Police in tactical gear surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa) (credit:AP)
Boston Marathon Explosions(61 of123)
Police in tactical gear surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa) (credit:AP)
Boston Marathon Explosions(62 of123)
Police in tactical gear arrive on an armored police vehicle as they surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa) (credit:AP)
Shootings In Cambridge, Watertown Draw Massive Police Response(63 of123)
WATERTOWN, MA - APRIL 19: Metro SWAT members hang off the back of a truck as they prepare to search the School and Walnut Street neighborhood for one remaining suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images) (credit:Getty Images)
Shootings In Cambridge, Watertown Draw Massive Police Response(64 of123)
WATERTOWN, MA - APRIL 19: Metro SWAT members hang off the back of a truck as they prepare to search the School and Walnut Street neighborhood for one remaining suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images) (credit:Getty Images)
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Two police officersstand guard at the perimeter of a locked down area as a search for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. Police killed one of the suspected Boston marathon bombing suspects in a shootout early today and pursued a chaotic deadly street-to-street manhunt for his accomplice, officials said. AFP PHOTO / STAN HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
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Two police officers stand guard at the perimeter of a locked down area as a search for the second of two suspects wanted in the Boston Marathon bombings takes place on April 19, 2013 in Watertown, Massachusetts. Police killed one of the suspected Boston marathon bombing suspects in a shootout early today and pursued a chaotic deadly street-to-street manhunt for his accomplice, officials said. AFP PHOTO / STAN HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
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Police officers stand guard in front of a shopping mall on the perimeter of a locked down area as a search for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. Police killed one of the suspected Boston marathon bombing suspects in a shootout early today and pursued a chaotic deadly street-to-street manhunt for his accomplice, officials said. More than 9,000 police, many armed with shotguns and automatic rifles, were sent to the town to find Suspect Two, one of two young men suspected of having carried out the bomb attack on Monday in which three people died and 180 were injured. AFP PHOTO / STAN HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
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Police officers stand guard in front of a shopping mall on the perimeter of a locked down area as a search for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. Police killed one of the suspected Boston marathon bombing suspects in a shootout early today and pursued a chaotic deadly street-to-street manhunt for his accomplice, officials said. More than 9,000 police, many armed with shotguns and automatic rifles, were sent to the town to find Suspect Two, one of two young men suspected of having carried out the bomb attack on Monday in which three people died and 180 were injured. AFP PHOTO / STAN HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
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Police officers stand next to a shopping mall on the perimeter of a locked down area as a search for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. Police killed one of the suspected Boston marathon bombing suspects in a shootout early today and pursued a chaotic deadly street-to-street manhunt for his accomplice, officials said. More than 9,000 police, many armed with shotguns and automatic rifles, were sent to the town to find Suspect Two, one of two young men suspected of having carried out the bomb attack on Monday in which three people died and 180 were injured. AFP PHOTO / STAN HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
Shootings In Cambridge, Watertown Draw Massive Police Response(70 of123)
WATERTOWN, MA - APRIL 19: Police convene on School and Walnut Street on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images) (credit:Getty Images)
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Boston Police mobilize in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)
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Boston Police mobilize in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)
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Police on School and Walnut Street on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images)
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Police convene on School and Walnut Street on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images)
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Police on School and Walnut Street as the search continues for a suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images)
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Police walk down School and Walnut Street on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Darren McCollester/Getty Images)
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Boston Police Commissioner Edward Davis speaks during a media briefing in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)
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Boston Police Commissioner Edward Davis speaks during a media briefing in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)
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Boston Police Commissioner Edward Davis speaks during a media briefing in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)
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Boston Police mobilize in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)
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Boston Police mobilize in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)
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Boston Police mobilize in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. According to reports, one suspect has been killed during a car chase and the police are seeking another - believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)
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Officials address the media during a news conference in Watertown, Mass., Friday, April 19, 2013. Officials are urging residents of Watertown and surrounding towns to stay indoors. One of two suspects in the Boston Marathon bombing is dead after the killing of a university officer and a shootout with police, and a massive manhunt is underway for the other, authorities said early Friday. (AP Photo/Julio Cortez)
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Kurt Schwartz, director of the Massachusetts Emergency Management Agency, addresses the media in Watertown, Mass., Friday, April 19, 2013. Officials are urging residents of Watertown and surrounding towns to stay indoors as manhunt for a suspect is ongoing. (AP Photo/Julio Cortez) (credit:AP)
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Police officers stand ready at a crime scene Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke) (credit:AP)
Shootings In Cambridge, Watertown Draw Massive Police Response(86 of123)
WATERTOWN, MA - APRIL 19: Boston Police Commissioner Edward Davis speaks during a media briefing in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Jared Wickerham/Getty Images) (credit:Getty Images)
Shootings In Cambridge, Watertown Draw Massive Police Response(87 of123)
WATERTOWN, MA - APRIL 19: Boston Police Commissioner Edward Davis speaks during a media briefing in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Jared Wickerham/Getty Images) (credit:Getty Images)
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Colonel Timothy Albens (C), of the Massachusetts State Police, Boston Police Commissioner Ed Davis (L) and Watertown Chief of Police Edward P. Deveau (R) speak to the media as a search for the second of the two suspects wanted in the Boston Marathon bombings takes place on April 19, 2013 in Watertown, Massachusetts. A Boston marathon bombing suspect captured by police died in hospital, local television channels reported early Friday. Police have told residents of the town of Watertown near Boston to stay indoors and 'stay away from windows' as they hunt a second suspect wanted for the attacks in which three people died and about 180 were injured. AFP PHOTO/STAN HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
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Officials brief the media on a standoff in Watertown, Mass., Friday, April 19, 2013. Authorities say one of two suspects in the Boston Marathon bombing is dead and a massive manhunt is underway for another in the Boston suburb of Watertown early Friday morning April 19, 2013. (AP Photo/Julio Cortez) (credit:AP)
Shootings In Cambridge, Watertown Draw Massive Police Response(90 of123)
WATERTOWN, MA - APRIL 19: Boston Police Commissioner Edward Davis speaks during a media briefing in the parking lot of the Watertown Mall on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Jared Wickerham/Getty Images) (credit:Getty Images)
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This surveillance photo released via Twitter Friday, April 19, 2013 by the Boston Police Department shows a suspect entering a convenience store that police are pursuing in Watertown, Mass. Police say he is one of two suspects in the fatal shooting of an MIT police officer and tied to the Boston Marathon bombing. (AP Photo/Boston Police Department) (credit:AP)
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Police officers work a crime scene Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke) (credit:AP)
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A bomb squad truck arrives at an incident Friday, April 19, 2013, in Watertown, Mass. in which shots were reported to have been fired. (AP Photo/Craig Ruttle) (credit:AP)
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Police officers aim their weapons Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke) (credit:AP)
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Police officers stand ready at a crime scene Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke) (credit:AP)
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A Police official looks over object that was picked up by a remote control device, left, as they investigate an incident in Friday, April 19, 2013, in Watertown, Mass. in which shots were reported to have been fired. (AP Photo/Craig Ruttle) (credit:AP)
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A police officers rides on the back of a van at a staging area as a manhunt is conducted for a suspect Friday, April 19, 2013, in Watertown, Mass. One of two suspects in the Boston Marathon bombing is dead and a massive manhunt is underway for another, authorities said early Friday April 19, 2013. Residents of Watertown, a Boston suburb, have been advised to keep their doors locked and not let anyone in. (AP Photo/Matt Rourke) (credit:AP)
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Heavily armed officers arrive during the investigation of an incident Friday, April 19, 2013, in Watertown, Mass. in which shots were reported to have been fired. (AP Photo/Craig Ruttle) (credit:AP)
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A police official looks over an object that was picked up by a remote control device, left, as they investigate an incident Friday, April 19, 2013, in Watertown, Mass. in which shots were reported to have been fired. (AP Photo/Craig Ruttle) (credit:AP)
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Police officers with their weapons out search for a suspect Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke) (credit:AP)
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Police officers work a crime scene Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke) (credit:AP)
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A police officer checks a driver at a check point as a search for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
Shootings In Cambridge, Watertown Draw Massive Police Response(103 of123)
WATERTOWN, MA - APRIL 19: Police set up a perimeter outside the Arsenal Mall as they pursue possible suspects following a spate of shootings on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Darren McCollester/Getty Images) (credit:Getty Images)
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A police officer at a check point as a search for the second of two suspects wanted in the Boston Marathon bombings takes place April 19, 2013 in Watertown, Massachusetts. A Boston marathon bombing suspect captured by police died in hospital, local television channels reported early Friday. Police have told residents of the town of Watertown near Boston to stay indoors and 'stay away from windows' as they hunt a second suspect wanted for the attacks in which three people died and about 180 were injured. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
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Police officers aim their weapons Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke) (credit:AP)
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Police officers walk near a crime scene Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke) (credit:AP)
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Police work a crime scene Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke) (credit:AP)
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Police officers walk near a crime scene Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings and amid a hunt for two suspects caused officers to converge on a neighborhood outside Boston, where residents heard gunfire and explosions.(AP Photo/Matt Rourke) (credit:AP)
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Officials work a crime scene in Watertown, Mass., Friday, April 19, 2013. Reports of explosives being detonated and police are telling reporters to turn off their cell phones. Dozens of officers and National Guard members are in Watertown, where television outlets report that gunfire and explosions have been heard. (AP Photo/Julio Cortez) (credit:AP)
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An armored vehicle arrives in Watertown, Mass., early Friday, April 19, 2013. Reports of explosives being detonated and police are telling reporters to turn off their cell phones. Dozens of officers and National Guard members are in Watertown, where television outlets report that gunfire and explosions have been heard. (AP Photo/Julio Cortez) (credit:AP)
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Officials work a crime scene in Watertown, Mass., Friday, April 19, 2013. Reports of explosives being detonated and police are telling reporters to turn off their cell phones. Dozens of officers and National Guard members are in Watertown, where television outlets report that gunfire and explosions have been heard. (AP Photo/Julio Cortez) (credit:AP)
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Officials secure an area in Watertown, Mass., Friday, April 19, 2013. Reports of explosives being detonated and police are telling reporters to turn off their cell phones. Dozens of officers and National Guard members are in Watertown, where television outlets report that gunfire and explosions have been heard. (AP Photo/Julio Cortez) (credit:AP)
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A police official looks over object that was picked up by a remote control device, left, as they investigate an incident in Friday, April 19, 2013, in Watertown, Mass. in which shots were reported to have been fired. (AP Photo/Craig Ruttle) (credit:AP)
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Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Mario Tama/Getty Images)
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Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Mario Tama/Getty Images)
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Police officers stand in a shopping mall as a search for the second of two suspects wanted in the Boston Marathon bombings takes place on April 19, 2013 in Watertown, Massachusetts. A Boston marathon bombing suspect captured by police died in hospital, local television channels reported early Friday. Police have told residents of the town of Watertown near Boston to stay indoors and 'stay away from windows' as they hunt a second suspect wanted for the attacks in which three people died and about 180 were injured. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
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Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Mario Tama/Getty Images)
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Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Mario Tama/Getty Images)
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Officers wearing tactical gear arrive at the Watertown neighborhood of Boston, Friday, April 19, 2013. Reports of explosives being detonated and police are telling reporters to turn off their cell phones. Dozens of officers and National Guard members are in Watertown, where television outlets report that gunfire and explosions have been heard. (AP Photo/Julio Cortez) (credit:AP)
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An FBI official arrives at the Watertown neighborhood of Boston, Friday, April 19, 2013. Reports of explosives being detonated and police are telling reporters to turn off their cell phones. Dozens of officers and National Guard members are in Watertown, where television outlets report that gunfire and explosions have been heard. (AP Photo/Julio Cortez) (credit:AP)
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A vehicle carrying officers in tactical gear arrives at the Watertown neighborhood of Boston, Friday, April 19, 2013. Reports of explosives being detonated and police are telling reporters to turn off their cell phones. Dozens of officers and National Guard members are in Watertown, where television outlets report that gunfire and explosions have been heard. (AP Photo/Julio Cortez) (credit:AP)
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Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Mario Tama/Getty Images)
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Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts. Earlier, a Massachusetts Institute of Technology campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. It's not clear whether the shootings are related or whether either are related to the Boston Marathon bombing. (Photo by Mario Tama/Getty Images)
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- Eight-year-old dies at Boston Marathon as he waits for father to pass finish line
- Martin Richard holds up handmade poster inscribed with the words: “No more hurting people, peace”
- President Obama has said the people responsible for the explosions in Boston will "feel the full weight of justice"