Martin Richard's father has spoken of his heartache after his eight-year-old son was killed and daughter and wife seriously injured in the devastating bombings of the Boston Marathon.

Martin Richard was among three people killed in Monday's blasts as he waited with his mother and two siblings to watch his father Bill Richard cross the marathon finish line.

martin richard boston marathon bombings victim

Martin Richard holds up a handmade 'Peace' poster

As well as claiming Martin's life, the explosion reportedly tore off one of five-year-old Jane's legs and delivered a blow to the head that gave Denise, 43, serious brain injuries.

Details of the devastating impact on a single family came as FBI agents vowed to "go to the ends of the earth" to hunt the culprits.

boston marathon explosion

Rescue workers responded to the scene following two explosions on Boylston Street in Boston near the finish line of the Boston Marathon

Krystle Campbell, 29, from Arlington, Massachusetts, who had been watching her boyfriend run the marathon, was named as the second spectator to have been killed in the attacks.

The Chinese Consulate in New York said this morning that the third was one of its citizens, a Boston University graduate student.

martin richard

Martin was killed in the attack. He was eight

In a statement issued to US media, Martin's father said: "My dear son Martin has died from injuries sustained in the attack on Boston. My wife and daughter are both recovering from serious injuries.

"We thank our family and friends, those we know and those we have never met, for their thoughts and prayers. I ask that you continue to pray for my family as we remember Martin.

He added: "We also ask for your patience and for privacy as we work to simultaneously grieve and recover. Thank you."

News outlets have published a photograph of Martin, from Dorchester, Massachusetts, holding a poster he drew in an art class last year, with the message, "No more hurting people".

The White House said last night that President Barack Obama will travel to Boston tomorrow to speak at a service dedicated to those killed and more than 170 injured, including 17 critically, by the explosions.

Miss Campbell's father, William, described his daughter, who worked for a restaurant consultancy firm, as a "wonderful, wonderful girl.

He told reporters: "She helped everybody, and I'm just so shocked right now. We're just devastated.

"She was a wonderful, wonderful girl. Always willing to lend a hand."

The student killed was one of three friends who watched the race near the finish line, Boston University said.

The Chinese Consulate released a statement saying she was a Chinese national, whose identity would not be released at her family's request.

Another Chinese citizen was among the injured and was in a stable condition after undergoing surgery, it added.

Mr Obama has confirmed the FBI is investigating the tragedy as an act of terrorism, as police recovered fragments of black nylon that may been from a bag used to conceal one or both of the bombs.

Speaking at a press conference, he said: "This was a heinous and cowardly act. The FBI is now investigating this as an act of terrorism."

But he added: "The American people refused to be terrorised. What the world saw yesterday in the aftermath of the explosions were stories of heroism and kindness and generosity and love."

Richard DesLauriers, the special agent in charge of the Boston FBI office, said there would be a "worldwide investigation".

"We will go to the ends of the earth to find the subject or subjects responsible for this despicable crime," he said.

There were no immediate claims of responsibility for the attack, the most serious in the US since the 9/11 atrocity.

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  • 8-year-old Martin Richard, killed in Boston Marathon blast

    8-year-old Martin Richard, killed in Boston Marathon blast

  • 8-year-old Martin Richard, killed in Boston Marathon blast

    8-year-old Martin Richard, killed in Boston Marathon blast

  • 8-year-old Martin Richard, killed in Boston Marathon blast

    8-year-old Martin Richard, killed in Boston Marathon blast

  • 8-year-old Martin Richard, killed in Boston Marathon blast

    8-year-old Martin Richard, killed in Boston Marathon blast

  • 8-year-old Martin Richard, killed in Boston Marathon blast

    Runner Megan Cloke pauses after placing flowers on the doorstep of the Richard house in the Dorchester neighborhood of Boston,Tuesday, April 16, 2013. Martin Richard,8, was killed in Mondays' bombings at the finish line of the Boston Marathon. The boy’s mother, Denise, and 6-year-old sister, Jane, were badly injured. (AP Photo/Michael Dwyer)

  • Jacqueline Myers and her daughter Amira, 10, depart after leaving flowers on the doorstep of the Richard house in the Dorchester neighborhood of Boston,Tuesday, April 16, 2013. Martin Richard, 8, was killed in Mondays bombing at the finish line of the Boston Marathon.(AP Photo/Michael Dwyer)

  • Jane Sherman, right, speaks with reporters about her neighbors, the Richard family, in the Dorchester neighborhood of Boston,Tuesday, April 16, 2013. Martin Richard, 8, was killed in Mondays bombing at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)

  • Two women leave after placing flowers on the doorstep of the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in the Mondays bombings at the finish line of the Boston Marathon. The boy’s mother, Denise, and 6-year-old sister, Jane, were badly injured. (AP Photo/Michael Dwyer)

  • Two women place flowers on the doorstep of the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in the Mondays bombings at the finish line of the Boston Marathon. The boy’s mother, Denise, and 6-year-old sister, Jane, were badly injured. (AP Photo/Michael Dwyer)

  • Neighbors hug outside the home of the Richard family in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Mondays bombing at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)

  • Peace is written on the sidewalk in front of the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Monday's bombing at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)

Loading Slideshow...
  • Neighbors come to pay their respects at the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Monday's bombings at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)

  • Tammy Lynch, right, comforts her daughter Kaytlyn, 8, after leaving flowers and some balloons at the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Kaytlyn was paying her respects to her friend, 8-year old Martin Richard who was killed in Monday's bombings at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)

  • Barack Obama

    President Barack Obama speaks in the Brady Press Briefing Room of the White House in Washington, Tuesday, April 16, 2013, following the explosions at the Boston Marathon. (AP Photo/Charles Dharapak)

  • Jodie Brown of England carries her luggage past a guarded checkpoint near the finish line of the Boston Marathon on her way to catch a plane in Boston Tuesday, April 16, 2013. (AP Photo/Winslow Townson)

  • First time Boston Marathon runner Amber Lazo of Miami pulls her luggage past a guarded checkpoint near the finish line of the Boston Marathon on her way to catch a flight in Boston Tuesday, April 16, 2013. Her sister, Jocelyn Siedle pushes thirteen-month-old Nina Lazo in a baby stroller behind her. (AP Photo/Winslow Townson)

  • Responders search the area around the Boston Public Library near the finish line of the Boston Marathon with a ladder truck in Boston Tuesday, April 16, 2013. Two bombs blew up seconds apart Monday at the finish line of one of the world's most storied races, tearing off limbs and leaving the streets spattered with blood and strewn with broken glass. At least three people were killed, including an 8-year-old boy, and more than 170 were wounded. (AP Photo/Winslow Townson)

  • Jodie Brown of England carries her luggage past a guarded checkpoint near the finish line of the Boston Marathon on her way to catch a plane in Boston Tuesday, April 16, 2013. Two bombs blew up seconds apart Monday at the finish line of one of the world's most storied races, tearing off limbs and leaving the streets spattered with blood and strewn with broken glass. Three people were killed, including an 8-year-old boy, and more than 170 were wounded. (AP Photo/Winslow Townson)

  • An Amtrak Police officer and his sniffer dog monitor travelers at the 30th Street Station Tuesday, April 16, 2013, in Philadelphia. The deadly explosions at the Boston Marathon on Monday reverberated on both sides of the Atlantic as cities from Los Angeles to London saw an increase in security. (AP Photo/Matt Rourke)

  • The flag flies at half staff in front of the Neighborhood House Charter School in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Boston Marathon bombing victim, 8-year old Martin Richard attended the school. (AP Photo/Michael Dwyer)

  • Barack Obama

    President Barack Obama finishes speaking in the Brady Press Briefing Room of the White House in Washington, Tuesday, April 16, 2013, about the Boston Marathon explosions.(AP Photo/Susan Walsh)

  • Nicholas Yanni

    Nicholas Yanni, 32, of Boston, speaks to reporters at Tufts Medical Center in Boston, Tuesday, April 16, 2013. Yanni, and his wife, Lee Ann Yanni, 31, not pictured, were among the 14 patients injured in the bombing at the finish of the Boston Marathon who were treated at Tufts. (AP Photo/Josh Reynolds)

  • A U.S. Capitol police officer monitors the area as an American flag flies at half-staff on Capitol Hill in Washington, Tuesday, April 16, 2013, after Monday's Boston Marathon explosions. (AP Photo/Jose Luis Magana)

  • Nicholas Yanni

    Nicholas Yanni, 32, of Boston, speaks to reporters at Tufts Medical Center in Boston, Tuesday, April 16, 2013. Yanni, and his wife, Lee Ann Yanni, 31, were among the 14 patients injured in the bombing at the finish of the Boston Marathon who were treated at Tufts. (AP Photo/Josh Reynolds)

  • Security personnel stand in front of a PATH train station at the World Trade Center site in New York, Tuesday, April 16, 2013. Police armed with rifles and extra patrol cars were stationed around the city Tuesday as New York remained in a heightened state of alert until more is known about the Monday bombings at the Boston Marathon. (AP Photo/Seth Wenig)

  • Los Angeles International Airport Police Officer, Daniel Keehne works security with partner Axa Tuesday April 16, 2013 at the airport in Los Angeles. Security measures have been increased in light of Monday's bombings at the Boston Marathon. (AP Photo/Nick Ut)

  • "Pray for Martin" is written in chalk at a park near the home of Martin Richard in the Dorchester neighborhood of Boston,Tuesday, April 16, 2013. 8-year old Martin was killed in the bombing at the finish line of the Boston Marathon on Monday. (AP Photo/Michael Dwyer)

  • Bureau of Alcohol, Tobacco and Firearms, (ATF) agents and Boston police detectives gather near the finish line of the Boston Marathon in Boston, Tuesday, April 16, 2013. The bombs that ripped through the crowd at the Boston Marathon, killing at least three people and wounding more than 170, were fashioned out of pressure cookers and packed with shards of metal, nails and ball bearings to inflict maximum carnage, a person briefed on the investigation said Tuesday. (AP Photo/Winslow Townson)

  • FBI agents gather near the finish line of the Boston Marathon in Boston Tuesday, April 16, 2013. The bombs that ripped through the crowd at the Boston Marathon, killing at least three people and wounding more than 170, were fashioned out of pressure cookers and packed with shards of metal, nails and ball bearings to inflict maximum carnage, a person briefed on the investigation said Tuesday. (AP Photo/Winslow Townson)

  • Bureau of Alcohol, Tobacco and Firearms, (ATF) agents and Boston police detectives gather near the finish line of the Boston Marathon in Boston, Tuesday, April 16, 2013. The bombs that ripped through the crowd at the Boston Marathon, killing at least three people and wounding more than 170, were fashioned out of pressure cookers and packed with shards of metal, nails and ball bearings to inflict maximum carnage, a person briefed on the investigation said Tuesday. (AP Photo/Winslow Townson)

  • Two men in haz-mat suits investigate the scene of the first bombing on Boylston Street in Boston Tuesday, April 16, 2013 near the finish line of the 2013 Boston Marathon, a day after two blasts nearby killed three and injured over 170 people. (AP Photo/Elise Amendola)

  • Investigators in haz-mat suits examine the scene of the second bombing on Boylston Street in Boston Tuesday, April 16, 2013 near the finish line of the 2013 Boston Marathon, a day after two blasts killed three and injured over 170 people. (AP Photo/Elise Amendola)

  • Investigators in haz-mat suits examine the scene of the second bombing on Boylston Street in Boston Tuesday, April 16, 2013 near the finish line of the 2013 Boston Marathon, a day after two blasts killed at least three and injured over 170 people. (AP Photo/Elise Amendola)

  • Flowers sit at a police barrier near the finish line of the Boston Marathon in Boston Tuesday, April 16, 2013. Explosions at the finish of the Marathon Monday Killed at least 3 people and injured over 170. (AP Photo/Winslow Townson)

  • James Skoufis, Patricia Fahy, Luis Sepulveda

    New York Assembly members James Skoufis, D-Woodbury, left, Patricia Fahy, D-Albany, center, and Luis Sepulveda, D-Bronx, join other legislators in a moment of silence for victims of the explosions at Monday's Boston Marathon, in the Assembly Chamber at the Capitol in Albany, N.Y., on Tuesday, April 16, 2013. (AP Photo/Mike Groll)

  • A jetliner flies over flags flying at half-staff at the Washington Monument in Washington, Tuesday, April 16, 2013, after President Obama ordered flags to be lowered on federal building to honor the loss of life from the explosions at the Boston Marathon. (AP Photo/J. David Ake)

  • A bystander takes a photo from a window as Seattle Police Dept. robots are used to remove an item from a suspicious backpack in downtown Seattle, Tuesday, April 16, 2013. The backpack was found to be harmless, but in light of Monday's explosions at the Boston Marathon, authorities in Seattle and other cities increased security patrols and heightened the level of alertness for any possible threat to public safety. (AP Photo/Ted S. Warren)

  • Ed Coco, Jill Coco

    Boston marathon runner Ed Coco, left, stands with his wife Jill Coco, both of Atlanta, after the couple arrived at Hartsfield-Jackson airport from Boston, Tuesday, April 16, 2013, in Atlanta. "The venue was just the most beautiful venue I've ever been at." said Ed Coco. "It's bittersweet. It's sad that it had to end that way. We're happy to be home. It's very nerve wrecking." The deadly explosions near the finish line at the Boston Marathon on Monday killed nearly three and injured more than 140 people. (AP Photo/David Goldman)

  • Two men in haz-mat suits investigate the scene near the first bombing on Boylston Street in Boston Tuesday, April 16, 2013 near the finish line of the 2013 Boston Marathon, a day after two blasts nearby killed at least three and injured over 170 people. (AP Photo/Elise Amendola)

  • Seattle Police Dept. vehicles block off a street in while remote controlled vehicles are used to examine a suspicious backpack in downtown Seattle, Tuesday, April 16, 2013. The backpack was found to be harmless, but in light of Monday's explosions at the Boston Marathon, authorities in Seattle and other cities increased security patrols and heightened the level of alertness for any possible threat to public safety. (AP Photo/Ted S. Warren)

  • A Seattle Police officer looks on as Seattle Police Dept. robots are used to open a suspicious backpack in downtown Seattle, Tuesday, April 16, 2013. The backpack was found to be harmless, but in light of Monday's explosions at the Boston Marathon, authorities in Seattle and other cities increased security patrols and heightened the level of alertness for any possible threat to public safety. (AP Photo/Ted S. Warren)

  • Birds fly away as a Seattle Police Dept. robotic vehicle is driven back to its truck after it was used to examine a suspicious backpack in downtown Seattle, Tuesday, April 16, 2013. The backpack was found to be harmless, but in light of Monday's explosions at the Boston Marathon, authorities in Seattle and other cities increased security patrols and heightened the level of alertness for any possible threat to public safety. (AP Photo/Ted S. Warren)

  • An official carries away a backpack that contained a hair dryer and other items after Seattle Police Dept. robots at left were used used to check out the suspicious backpack in downtown Seattle, Tuesday, April 16, 2013. The backpack was found to be harmless, but in light of Monday's explosions at the Boston Marathon, authorities in Seattle and other cities increased security patrols and heightened the level of alertness for any possible threat to public safety. (AP Photo/Ted S. Warren)

  • Neighbors hug outside the home of the Richard family in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Mondays bombing at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)

  • Peace is written on the sidewalk in front of the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Monday's bombing at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer)

  • Two women place flowers on the doorstep of the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in the Mondays bombings at the finish line of the Boston Marathon. The boy’s mother, Denise, and 6-year-old sister, Jane, were badly injured. (AP Photo/Michael Dwyer)

  • US-ATTACKS-BOSTON

    Boston police officers near a Humvee April 16, 2013 in Boston, Massachusetts, in the aftermath of two explosions that struck near the finish line of the Boston Marathon April 15. A massive probe was underway Tuesday after two bombs struck the Boston Marathon, killing at least three and wounding more than 100. Monday's blasts near the finishing line raised fears of a terrorist attack more than a decade after nearly 3,000 people were killed in suicide airliner strikes on New York, Washington and Pennsylvania on September 11, 2001. US President Barack Obama went on national television to warn against 'jumping to conclusions' but a senior White House official, speaking on condition of anonymity, said such an attack was 'clearly an act of terror.' AFP PHOTO Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON - APRIL 16: Police officers stand near the Boston Marathon finish line from Clarendon and Boylston Street on April 16, 2013 in Boston, Massachusetts. Security is especially tight in the city of Boston after two explosions went off near the finish of the Marathon, killing three people and injuring at least 141 others. (Photo by Darren McCollester/Getty Images)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON - APRIL 16: A sign on a door makes notice of being closed at Trident Booksellers Cafe on Newbury Street shows closed on April 16, 2013 in Boston, Massachusetts. Security is especially tight in the city of Boston after two explosions went off near the finish of the Marathon, killing three people and injuring at least 141 others. (Photo by Darren McCollester/Getty Images)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON, MA - APRIL 16: Claire Schaeffer Dufy walks with a sign she made to support her runner husband, Scott, near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images)

  • Workers find bags containing runners' personal effects as they return them to their owner near the finish line of the Boston Marathon, after explosions killed three and injured more than 140 in Boston, Tuesday, April 16, 2013. The bombs that blew up seconds apart at the finish line of one of the world's most storied races left the streets spattered with blood and glass, and gaping questions of who chose to attack at the Boston Marathon and why. (AP Photo/Charles Krupa)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON, MA - APRIL 16: People congregate at a security gate near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON, MA - APRIL 16: A Boston police officer stands guard near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON, MA - APRIL 16: A napkin and broken salt and pepper shakers are seen after customers fled an outdoor restaurant near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON, MA - APRIL 16: The unfinished meals of fleeing customers are left on tables at an outdoor restaurant near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON, MA - APRIL 16: A heavily armed Boston police officer stands blocks away from the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON, MA - APRIL 16: Unused thermal blankets for marathon participants are piled near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON, MA - APRIL 16: A Boston police officer stands near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON, MA - APRIL 16: A runner stands at a security gate near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON, MA - APRIL 16: A Boston police officer stands near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON, MA - APRIL 16: National Guard soldiers walk near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images)

  • Boston Deals With Aftermath Of Marathon Explosions

    BOSTON, MA - APRIL 16: A discarded runners bib is viewed near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images)