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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 - 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)

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    See Getty's most iconic images of 2013

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See Getty's most iconic images of 2013

Getty Images CEO Jonathan Klein shares the most iconic photos of 2013.

See Getty's most iconic images of 2013

Getty Images CEO Jonathan Klein shares the most iconic photos of 2013.