British Prime Minister David Cameron, center, and his wife Samantha, third from left, pay their respects to Katherine Wolf alongside her husband Charles, second from right, 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 his wife Samantha, third from left, pay their respects to Katherine Wolf alongside her husband Charles, second from right, 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 his wife Samantha, third from left, pay their respects to Katherine Wolf alongside her husband Charles, second from right, 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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