7 / 26
Boston marathon explosions
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)

What to Read Next

Explosions rock Boston Marathon

April 15, 2013

Two explosions struck the Boston Marathon as runners crossed the finish line on Monday, injuring many.