Explosions At 117th Boston Marathon

The scene of the explosions at the Boston Marathon. (David L. Ryan/The Boston Globe via Getty Images)

The scene of the explosions at the Boston Marathon. (David L. Ryan/The Boston Globe via Getty Images)

Download Original: 594 × 530 (Updates) 3 Killed, More Than 170 Wounded in Boston Marathon Explosions

BOSTON – APRIL 15: 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)