Heroic first responders at Boston Marathon

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)

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

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