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Scenes From the Boston Marathon Bombing

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.

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Scenes From the Boston Marathon Bombing

Four hours, nine minutes and 43 seconds into the race, the first explosion rocked runners and spectators at the finish line of the 117th-annual Boston Marathon. Then 12 seconds later, a second explosion erupted. The jubilation of completing a grueling 26.2-mile race turned to chaos and terror. Here are some scenes from the catastrophe, one of the nation's worst attacks since Sept. 11, 2001.

By CNBC.com
Posted 16 April 2013

John Tlumacki | The Boston Globe | Getty Images