In this photo posted on the U.S. Embassy in Tripoli's Facebook page on Wednesday, Aug. 12, 2012, U.S. Ambassador to Libya J. Christopher Stevens (left) poses with a shop owner in Tripoli, Libya. Libyan officials say Mr. Stevens and three other Americans were killed in an attack on the U.S. Consulate in the eastern city of Benghazi by protesters angry over a film that ridicules Islam's Prophet Muhammad. (AP Photo/U.S. Embassy in Tripoli)

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In this photo posted on the U.S. Embassy in Tripoli's Facebook page on Wednesday, Aug. 12, 2012, U.S. Ambassador to Libya J. Christopher Stevens (left) poses with a shop owner in Tripoli, Libya. Libyan officials say Mr. Stevens and three other Americans were killed in an attack on the U.S. Consulate in the eastern city of Benghazi by protesters angry over a film that ridicules Islam's Prophet Muhammad. (AP Photo/U.S. Embassy in Tripoli)