British Prime Minister David Cameron, center, speaks to the media as Massachusetts Gov. Deval Patrick, right, listens during a visit at the makeshift memorial to the Boston Marathon bombing victims in Copley Square in Boston, Tuesday, May 14, 2013. Cameron is in Boston to offer his condolences and discuss lessons that can be learned from the deadly bombings. (AP Photo/Michael Dwyer)

Associated Press
British Prime Minister David Cameron, center, speaks to the media as Massachusetts Gov. Deval Patrick, right, listens during a visit at the makeshift memorial to the Boston Marathon bombing victims in Copley Square in Boston, Tuesday, May 14, 2013. Cameron is in Boston to offer his condolences and discuss lessons that can be learned from the deadly bombings. (AP Photo/Michael Dwyer)
British Prime Minister David Cameron, center, speaks to the media as Massachusetts Gov. Deval Patrick, right, listens during a visit at the makeshift memorial to the Boston Marathon bombing victims in Copley Square in Boston, Tuesday, May 14, 2013. Cameron is in Boston to offer his condolences and discuss lessons that can be learned from the deadly bombings. (AP Photo/Michael Dwyer)
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