Who bombed Boston? Security ratchets up in U.S., around world

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APTOPIX Boston Marathon Explosions
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APTOPIX Boston Marathon Explosions
Medical workers aid an injured woman at the finish line of the 2013 Boston Marathon following two explosions there, Monday, April 15, 2013 in Boston. Two bombs exploded near the finish of the Boston Marathon on Monday, killing at least two people, injuring at least 23 others and sending authorities rushing to aid wounded spectators. (AP Photo/Charles Krupa)