British Prime Minister David Cameron, center, and Charles Wolf, right, watch as Samantha Cameron places flowers in honor of Wolf's wife Katherine during a visit to the National September 11 Memorial, Thursday, March 15, 2012 in New York. (AP Photo/Mary Altaffer, Pool)

Associated Press
British Prime Minister David Cameron, center, and Charles Wolf, right, watch as Samantha Cameron places flowers in honor of Wolf's wife Katherine during a visit to the National September 11 Memorial, Thursday, March 15, 2012 in New York.  (AP Photo/Mary Altaffer, Pool)
British Prime Minister David Cameron, center, and Charles Wolf, right, watch as Samantha Cameron places flowers in honor of Wolf's wife Katherine during a visit to the National September 11 Memorial, Thursday, March 15, 2012 in New York. (AP Photo/Mary Altaffer, Pool)
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