A second explosion goes off (rear) as a runner was blown to the ground by the first explosion near the finish line of the 117th Boston Marathon. (Photo by John Tlumacki/The Boston Globe via Getty ... more 
A second explosion goes off (rear) as a runner was blown to the ground by the first explosion near the finish line of the 117th Boston Marathon. (Photo by John Tlumacki/The Boston Globe via Getty Images) less 
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Getty Images | Photo By John Tlumacki/The Boston Globe via Getty Images
Fri, Apr 11, 2014 4:00 PM EDT