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, April 15, 2013. Two bombs exploded near the finish line of the Boston Marathon on Monday, killing two people, injuring 23 others and sending authorities rushing to aid wounded spectators. A senior U.S. intelligence official said two other explosive devices were found nearby. (AP Photo/Elise Amendola)

Associated Press
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, April 15, 2013. Two bombs exploded near the finish line of the Boston Marathon on Monday, killing two people, injuring 23 others and sending authorities rushing to aid wounded spectators. A senior U.S. intelligence official said two other explosive devices were found nearby.  (AP Photo/Elise Amendola)
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, April 15, 2013. Two bombs exploded near the finish line of the Boston Marathon on Monday, killing two people, injuring 23 others and sending authorities rushing to aid wounded spectators. A senior U.S. intelligence official said two other explosive devices were found nearby. (AP Photo/Elise Amendola)
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