Suspects 1 and 2(01 of36)
Open Image Modal (credit:FBI)
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Open Image ModalThis 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)
Open Image Modal (credit:FBI)
Suspect 1(04 of36)
Open Image Modal (credit:FBI)
Suspect 1(05 of36)
Open Image Modal (credit:FBI)
Suspect 1(06 of36)
Open Image Modal (credit:FBI)
Suspect 2(07 of36)
Open Image Modal (credit:FBI)
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Open Image ModalThis 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)
Open Image Modal (credit:FBI)
(10 of36)
Open Image ModalThis 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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Open Image ModalThis 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)
(12 of36)
Open Image ModalThis 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)
Open Image Modal (credit:FBI)
(14 of36)
Open Image ModalThis 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)
Open Image Modal (credit:FBI)
(16 of36)
Open Image ModalThis 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)
Open Image Modal (credit:FBI)
(18 of36)
Open Image ModalThis 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)
Open Image ModalThis 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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Open Image ModalThis 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)
Open Image ModalGraphic 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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Open Image ModalThis 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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Open Image ModalThis 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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Open Image ModalThis 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)
(25 of36)
Open Image ModalThis 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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Open Image ModalThis 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)
Open Image ModalGraphic 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)
Screen shot 2013-04-19 at 14(28 of36)
Open Image Modal(29 of36)
Open Image ModalTamerlan 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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Open Image ModalTamerlan Tsarnaev practices boxing at the Wai Kru Mixed Martial Arts center in April 2009 in Boston, Mass.
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Open Image ModalTamerlan Tsarnaev practices boxing at the Wai Kru Mixed Martial Arts center in April 2009 in Boston.
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Open Image ModalTamerlan Tsarnaev practices boxing at the Wai Kru Mixed Martial Arts center in April 2009 in Boston.
Tamerlan Tsarnaev(33 of36)
Open Image ModalTamerlan Tsarnaev practices boxing at the Wai Kru Mixed Martial Arts center in April 2009 in Boston.
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Open Image ModalTamerlan Tsarnaev practices boxing at the Wai Kru Mixed Martial Arts center in April 2009 in Boston.
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Open Image ModalTamerlan Tsarnaev practices boxing at the Wai Kru Mixed Martial Arts center in April 2009 in Boston.
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Open Image ModalTamerlan Tsarnaev