Heroic first responders at Boston Marathon

EMS workers and civilian Bostonians tend to the wounded after two fatal explosions that injured dozens at the Boston Marathon.

Boston Marathon Victims: Heartbreak and Heroism

First responders and fellow runners rushed to aid victims, some of whom had lost limbs.

Joe Andruzzi helps victims of the Boston Marathon bombing

Former New England Patriots player Joe Andruzzi carries a woman from the scene after two explosions went off near the finish line of the Boston Marathon. (Photo: Bill Greene/The Boston Globe via Getty Images)

BOSTON - APRIL 15: The injured are helped at the scene of the first explosion on Boylston Street near the finish line of the Boston Marathon. (Photo by John Tlumacki/The Boston Globe via Getty Images)

BOSTON - 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. (Photo by David L. Ryan/The Boston Globe via Getty Images)

BOSTON - APRIL 15: A 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. (Photo by John Tlumacki/The Boston Globe via Getty Images)

BOSTON - APRIL 15: Passersby help an injured man on the sidewalk near Marathon Sports after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. (Photo by David L. Ryan/The Boston Globe via Getty Images)

Explosions At 117th Boston Marathon

Bystanders help an injured woman at the scene of the first explosion on Boylston Street near the finish line of the 117th Boston Marathon. (Photo by John Tlumacki/The Boston Globe via Getty Images)

A woman is helped from the scene on Boylston Street with bandages around her leg (Photo by Bill Greene/The Boston Globe via Getty Images)

Boston Marathon Explosions: 'Like a War Zone'

ABC News' Tahman Bradley has the latest in Boston where two bombs killed three people.

BOSTON - APRIL 15: Police officers with their guns drawn hear the second explosion down the street. The first explosion knocked down a runner at the finish line of the 117th Boston Marathon. (Photo by John Tlumacki/The Boston Globe via Getty Images)

Boston marathon explosions

iBOSTON, MA - APRIL 15: 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, Massachusetts. Two people are confirmed dead and at least 23 injured after two explosions went off near the finish line to the marathon. (Photo by Jim Rogash/Getty Images)

Multiple People Injured After Explosions Near Finish Line at Boston Marathon

BOSTON, MA - APRIL 15: The bandaged leg of a man hangs outside an ambulance outside a medical tent located ear the finish of the 117th Boston Marathon after two bombs exploded on the marathon route on April 15, 2013 in Boston, Massachusetts. Two people are confirmed dead and at least 23 injured after two explosions went off near the finish line to the marathon. (Photo by Jim Rogash/Getty Images)

Boston marathon explosions

iBOSTON, MA - APRIL 15: 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, Massachusetts. Two people are confirmed dead and at least 23 injured after two explosions went off near the finish line to the marathon. (Photo by Jim Rogash/Getty Images)

Boston marathon explosions

BOSTON, MA - APRIL 15: 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, Massachusetts. Two people are confirmed dead and at least 23 injured after two explosions went off near the finish line to the marathon. (Photo by Jim Rogash/Getty Images)

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