New York City Mayor Michael Bloomberg, left, British Prime Minister David Cameron, second from right, and his wife Samantha pay their respects to World Trade Center victim, Katherine Wolf alongside her husband Charles, right, during a visit to the National September 11 Memorial, Thursday, March 15, 2012 in New York. (AP Photo/Mary Altaffer, Pool)

Associated Press
New York City Mayor Michael Bloomberg, left, British Prime Minister David Cameron, second from right, and his wife Samantha pay their respects to World Trade Center victim, Katherine Wolf alongside her husband Charles, right, during a visit to the National September 11 Memorial, Thursday, March 15, 2012 in New York.  (AP Photo/Mary Altaffer, Pool)
New York City Mayor Michael Bloomberg, left, British Prime Minister David Cameron, second from right, and his wife Samantha pay their respects to World Trade Center victim, Katherine Wolf alongside her husband Charles, 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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