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In this image from video provided by WBZ TV, spectators and runners run from what was described as twin explosions that shook the finish line of the Boston Marathon, Monday, in Boston. Full story (AP Photo/WBZTV)
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Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday. Full story (AP Photo/Charles Krupa)
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Medical workers wheel the injured across the finish line during the 2013 Boston Marathon following an explosion in Boston, Monday. Full story (AP Photo/Charles Krupa
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An unidentified Boston Marathon runner leaves the course crying near Copley Square following an explosion in Boston Monday. Full story (AP Photo/Winslow Townson)
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Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday. Full story (AP Photo/Charles Krupa)
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Medical workers aid injured people at the finish line of the 2013 Boston Marathon following explosions in Boston, Monday. Full story (AP Photo/Charles Krupa)
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Police clear the area at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday. Full story (AP Photo/Charles Krupa)
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Medical responders run an injured man past the finish line the 2013 Boston Marathon following an explosion in Boston. Full story (AP Photo/Charles Krupa)
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A Boston police officer wheels in injured boy down Boylston Street as medical workers carry an injured runner following an explosion during the 2013 Boston Marathon in Boston, Monday. Full story (AP Photo/Charles Krupa)
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Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion Monday in Boston. Full story (AP Photo/Charles Krupa)
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A Boston police officer clears Boylston Street following an explosion at the finish line of the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Full story (AP Photo/Charles Krupa)
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An injured person is loaded into an ambulance in the aftermath of two blasts which exploded near the finish line of the Boston Marathon in Boston Monday. Full story (AP Photo/Elise Amendola)
