Explosions At Boston Marathon

A pair of explosions rock the Boston Marathon finish line on April 15, 2013. (credit: WBZ-TV)

Boston Marathon Bombings

It was a day nobody could have imagined. On April 15, 2013, as thousands of runners were victoriously completing their 26.2 mile journey, a pair of explosions shook the Boston Marathon finish line. When the dust literally settled, three people were dead, hundreds more injured, and countless everyday heroes rushed in to help the victims. It became clear almost immediately that Boston had been struck by terrorism. (Photo: WBZ-TV)
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finish line boston marathon

(credit: WBZ-TV)

Finish line explosions

The scene at he finish line after the explosions. (credit: WBZ-TV)

Boston Marathon Bombing

A runner reacts near Kenmore Square after two bombs exploded during the 117th Boston Marathon on April 15, 2013 in Boston. (credit: Alex Trautwig/Getty Images)

Boston Marathon Bombing

A 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 April 15, 2013 in Boston. (credit: Alex Trautwig/Getty Images)

Boston Marathon Bombing

A 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 April 15, 2013 in Boston. (credit: Alex Trautwig/Getty Images)

Boston Marathon Bombing

A 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, 2013 in Boston. (credit: Jim Rogash/Getty Images)

Boston Marathon Bombing

A 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, 2013, in Boston. (credit: Jim Rogash/Getty Images)

Boston Marathon Bombing

A 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, 2013, in Boston. (credit: Jim Rogash/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

State police guard an area near Kenmore Square after two bombs exploded during the 117th Boston Marathon. (Photo by Alex Trautwig/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

A woman is loaded into an ambulance after she was injured by one of two bombs exploded during the 117th Boston Marathon near Copley Square. (Photo by Jim Rogash/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

A woman looks at the blood on her hands as she is loaded into an ambulance after being injured after two bombs exploded on the marathon route. (Photo by Jim Rogash/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

Runners react near Kenmore Square after two bombs exploded during the 117th Boston Marathon. (Photo by Alex Trautwig/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

People react to a suspicious package on the corner of Dartmouth and Stuart St after two bombs exploded during the 117th Boston Marathon. (Photo by Darren McCollester/Getty Images)

Explosion

People leaving Copley Place Offices. (Credit: WBZ-TV's Ken Tucci)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

Police and runners stand near Kenmore Square after two bombs exploded during the 117th Boston Marathon. (Photo by Alex Trautwig/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

Runners gather near Kenmore Square after two bombs exploded during the 117th Boston Marathon. (Photo by Alex Trautwig/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

A runner uses his phone as others gather near Kenmore Square after two bombs exploded during the 117th Boston Marathon. (Photo by Alex Trautwig/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

A member of the bomb squad investigates a suspicious item on the road near Kenmore Square after two bombs exploded during the 117th Boston Marathon. (Photo by Alex Trautwig/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

A woman looks on as runners pass near Kenmore Square after two bombs exploded during the 117th Boston Marathon. (Photo by Alex Trautwig/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

A police officer directs people around the finish line at the corner of Boylston Street and Massachusetts Avenue after two explosives detonated during the 117th Boston Marathon. (Photo by Darren McCollester/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

The outer perimeter near Massachusetts Avenue and Newbury Street is secured by police after two explosive devices detonated at the finish line of the 117th Boston Marathon. (Photo by Alex Trautwig/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

The outer perimeter near Massachusetts Avenue and Newbury Street is secured by police and MBTA authorities after two explosive devices detonated at the finish line of the 117th Boston Marathon. (Photo by Alex Trautwig/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

The outer perimeter near Massachusetts Avenue and Newbury Street is secured by police after two explosive devices detonated at the finish line of the 117th Boston Marathon. (Photo by Alex Trautwig/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

Beacon Street near Kenmore Square remains empty for the use of emergency vehicles after two explosive devices detonated at the finish line of the 117th Boston Marathon. (Photo by Alex Trautwig/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

Beacon Street near Kenmore Square remains empty for the use of emergency vehicles after two explosive devices detonated at the finish line of the 117th Boston Marathon. (Photo by Alex Trautwig/Getty Images)

Multiple People Injured After Explosions Near Finish Line at 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 at the finish line of the 117th Boston Marathon. (Photo: Darren McCollester/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

A swat team arrives at the corner of Stuart Street and Dartmouth Street after two explosive devices detonated at the finish line of the 117th Boston Marathon. (Photo: Darren McCollester/Getty Images)

Multiple People Injured After Explosions Near Finish Line at 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 at the finish line of the 117th Boston Marathon. (Photo: Darren McCollester/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

Boston Police Commissioner Ed Davis, along with (L - R) U.S. Congressman Stephen Lynch, U.S. Senator Elizabeth Warren, and Governor Deval Patrick, addresses the media regarding mulitple explosions during the 117th Boston Marathon. (Photo by Darren McCollester/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

Armed police officers and Drug Enforcement Agency (DEA) agents secure the main entrance to Brigham and Women's Hospital. (Photo credit: STAN HONDA/AFP/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

A SWAT team from the NorthEastern Massachusetts Law Enforcement Council, a consortium of police agencies, secure the main entrance to Brigham and Women's Hospital. (Photo credit: STAN HONDA/AFP/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

Police and federal officials exit an apartment complex at 364 Ocean Avenue with a possible connection to the earlier explosions during the Boston Marathon. (Photo by Darren McCollester/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

Unclaimed finish line bags are viewed near the scene of a twin bombing at the Boston Marathon. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

Boston Police stand near the scene of a twin bombing at the Boston Marathon. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

The marathon finish line bridge is seen on Boylston Street on April 16, 2013. (Photo by Darren McCollester/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

SWAT team members and special police units assemble in the Boston Common on April 16, 2013 in Boston, Massachusetts. (Photo by Darren McCollester/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

A heavily armed Boston police officer stands guard in front of the Taj Hotel April 16, 2013 in Boston, Massachusetts. (Photo: STAN HONDA/AFP/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

Boston police officers near a Humvee April 16, 2013 in Boston, Massachusetts. (Photo credit: STAN HONDA/AFP/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

A sign on a door makes notice of being closed at Trident Booksellers Cafe on Newbury Street. (Photo by Darren McCollester/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

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. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

A National Guard soldier checks identification near a roadblock near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

Media gather at the bottom of a deserted Boylston Street April 16, 2013, near the site where two explosions rocked the Boston Marathon. (Photo by JOHN MOTTERN/AFP/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

Flowers are left at a security gate near the scene of the bombing attack at the Boston Marathon. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

People congregate, including many runners, at a security gate near the scene of yesterday's bombing attack at the Boston Marathon. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

People congregate, including many runners, at a security gate near the scene of yesterday's bombing attack at the Boston Marathon. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

A young runner (L) collects his thoughts in a church blocks away from the scene of yesterday's bombing attack at the Boston Marathon. (Photo by Spencer Platt/Getty Images)