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Boston marathon explosions

BOSTON - APRIL 15: Two officials run away from the first explosion, right, on Boylston Street at the 177th Boston Marathon, April 15, 2013. (Photo by John Tlumacki/The Boston Globe via Getty Images)

Explosions rock Boston Marathon

April 15, 2013

Two explosions struck the Boston Marathon as runners crossed the finish

line on Monday, injuring many.

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