Man comforts an injured woman on the sidewalk at the scene of the first explosion on Boylston Street near the finish line of the Boston Marathon.
Runner reacts near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts. Two people...
Runner embraces another woman on the marathon route near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013...
Boston: Marathoner Jacqueline Hansen of California State Univ., is followed by newsmen after winning the women's division of the 26-mi., 385 yd.,...
Emily Locher Weston, Connecticut looks out as runners pass near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15,...
Two blood stained feet of a man hangs outside an ambulance outside a medical tent located near the finish of the 117th Boston Marathon after two...
Member of the bomb squad investigates a suspicious item on the road near Kenmore Square after two bombs exploded during the 117th Boston Marathon on...
Second explosion goes off as a runner was blown to the ground by the first explosion near the finish line of the 117th Boston Marathon.
Officials react as the first explosion goes off on Boylston Street near the finish line of the 117th Boston Marathon on April 15, 2013.
Emergency personnel respond to the scene after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. Victim...
Person who was injured in an explosion near the finish line of the 117th Boston Marathon is taken away from the scene on a stretcher.
First responders tend to the wounded where two explosions occurred along the final stretch of the Boston Marathon on Boylston Street in Boston,...
First responders rush to help injured people after two explosions occurred along the final stretch of the Boston Marathon on Boylston Street in...
Two officials run away from the first explosion, right, on Boylston Street at the 177th Boston Marathon, April 15, 2013.
Rita Jeptoo of Kenya crosses the finish line to win the women's division of the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts.
Jenna Dziedzic of Boston, MA, Sabrina Dellorusso of Boston, MA, Linda Witt of Neenah, WI, and Jillian Boynton of Manchester, NH, react during a...
Boston police officer Roy Broussard observes a moment of silence at 2:49 p.m. ET near the finish line of the Boston Marathon on Boylston Street,...
Runners who participated in the 2013 Boston Marathon run down pit road during the IZOD IndyCar Series 97th running of the Indianpolis 500 mile race...
Runners who participated in the 2013 Boston Marathon run down pit road during the IZOD IndyCar Series 97th running of the Indianpolis 500 mile race...
Runners who participated in the 2013 Boston Marathon run down pit road during the IZOD IndyCar Series 97th running of the Indianpolis 500 mile race...
Teams conduct a house to house search in an area near last night's shootout during the ongoing manhunt for a suspect in the terrorist bombing of the...
Teams conduct a house to house search in an area near last night's shootout during the ongoing manhunt for a suspect in the terrorist bombing of the...
Teams conduct a house to house search in an area near last night's shootout during the ongoing manhunt for a suspect in the terrorist bombing of the...
Heightened security by Transit police is evident at Metro Center after the bombing at the Boston Marathon Monday April 15, 2013 in Washington, DC.
Heightened security by Transit police is evident at Metro Center after the bombing at the Boston Marathon Monday April 15, 2013 in Washington, DC.
Keith Yandle of the Phoenix Coyotes has the words "Pray For Boston" written on the side of his skates in honor of the Boston Marathon explosions...
The Brooklyn Nets and the Washington Wizards observe a moment of silence for those injured and killed due to the bombing at the Boston Marathon...
The Brooklyn Nets and the Washington Wizards observe a moment of silence for those injured and killed due to the bombing at the Boston Marathon...
Woman turns away from the entrance of the Arlington T station at the intersection of Arlington and Boylston, where service was suspended after two...
Employees surround the entrance of the Arlington Street T station, where service was halted briefly after two explosions went off near the finish...
President Barack Obama makes a statement in the White House briefing room about the bombings that took place at the Boston Marathon April 15, 2013 in...
President Barack Obama walks away after speaking about today's bombing at the Boston Marathon, April 15, 2013 in Washington, DC. Two people are...
Woman kneels and prays at the scene of the first explosion on Boylston Street near the finish line of the 117th Boston Marathon on April 15, 2013.
President Barack Obama makes a statement in the White House briefing room about the bombings that took place at the Boston Marathon April 15, 2013 in...
President Barack Obama makes a statement in the White House briefing room about the bombings that took place at the Boston Marathon April 15, 2013 in...
President Barack Obama pauses as he speaks on the Boston marathon explosions on April 15, 2013 in the Brady Briefing Room of the White House in...
Police clear the bleachers after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013.
Boston Police look at blown out windows at the scene of the first explosion on Boylston Street near the finish line of the Boston Marathon.
An injured boy is pushed in a wheelchair by a Boston police officer at the scene of the first explosion near the finish line of the Boston Marathon.
Runners react near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts. Two people...
Man is loaded into an ambulance after he was injured by one of two bombs exploded during the 117th Boston Marathon near Copley Square on April 15,...
Man is loaded into an ambulance after he was injured by one of two bombs exploded during the 117th Boston Marathon near Copley Square on April 15,...
First responders tend to the wounded, including a young boy in a wheelchair, where two explosions occurred along the final stretch of the Boston...
Firemen carry an injured person where two explosions occurred along the final stretch of the Boston Marathon on Boylston Street in Boston,...
First responders load injured people into an ambulance where two explosions occurred along the final stretch of the Boston Marathon on Boylston...
First responders transport an injured woman in a wheelchair where two explosions occurred along the final stretch of the Boston Marathon on Boylston...
Rita Jeptoo of of Kenya winner of the women's division and Lelisa Desisa Benti of Ethiopia, winner of the men's division, hold a trophy during...
Lelisa Desisa Benti of Ethiopia holds the trophy after winning the men’s division of the 117th Boston Marathon as Duval Patrick, governor of...
Lelisa Desisa Benti of Ethiopia crosses the finish line to win the men's division of the 117th Boston Marathon on April 15, 2013 in Boston,...
Rita Jeptoo of Kenya crosses the finish line to win the women's division of the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts.
Lelisa Desisa Benti of Ethiopia crosses the finish line to win the men's division of the 117th Boston Marathon on April 15, 2013 in Boston,...
Boston Marathon volunteer Lydia wears a marathon jacket while she visits a makeshift memorial for victims near the site of the Boston Marathon...
Runners listen to directions from a Boston Police officer at the corner of Stuart Street and Dartmouth Street after two explosive devices detonated...
Runners gather near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston, Massachusetts. Two people...
Woman is loaded into an ambulance after he was injured by one of two bombs exploded during the 117th Boston Marathon near Copley Square on April 15,...
Emergency personnel respond to the scene after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013.
