British Prime Minister David Cameron, left, and his wife Samantha, center, look over the World Trade Center site during a tour of the 21st floor of the 1 World Trade Center with Port Authority of NY and NJ Executive Director Patrick J. Foye, Thursday, March 15, 2012 in New York. (AP Photo/Mary Altaffer, Pool)

Associated Press
British Prime Minister David Cameron, left, and his wife Samantha, center,  look over the World Trade Center site during a tour of the 21st floor of the 1 World Trade Center with Port Authority of NY and NJ Executive Director Patrick J. Foye, Thursday, March 15, 2012 in New York.  (AP Photo/Mary Altaffer, Pool)
British Prime Minister David Cameron, left, and his wife Samantha, center, look over the World Trade Center site during a tour of the 21st floor of the 1 World Trade Center with Port Authority of NY and NJ Executive Director Patrick J. Foye, Thursday, March 15, 2012 in New York. (AP Photo/Mary Altaffer, Pool)
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