British Prime Minister David Cameron, right, and Massachusetts Gov. Deval Patrick visit the makeshift memorial to the Boston Marathon bombing victims in Copley Square in Boston, Tuesday, May 14, 2013. (AP Photo/Michael Dwyer)

Associated Press
British Prime Minister David Cameron, right, and Massachusetts Gov. Deval Patrick visit the makeshift memorial to the Boston Marathon bombing victims in Copley Square in Boston, Tuesday, May 14, 2013. (AP Photo/Michael Dwyer)
British Prime Minister David Cameron, right, and Massachusetts Gov. Deval Patrick visit the makeshift memorial to the Boston Marathon bombing victims in Copley Square in Boston, Tuesday, May 14, 2013. (AP Photo/Michael Dwyer)
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