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BOSTON - APRIL 15: The Cambridge Police department's bomb squad was at the intersection of Arlington and Boylston Streets, where they investigated unattended personal items left behind after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. (Photo by Barry Chin/The Boston Globe via Getty Images)
BOSTON - APRIL 15: The Cambridge Police department's bomb squad was at the intersection of Arlington and Boylston Streets, where they investigated unattended personal items left behind after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. (Photo by Barry Chin/The Boston Globe via Getty Images)

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Las autoridades dicen que las bombas eran artesanales, y estaban en los recipientes de basura.