**FILE** In this photo posted on the U.S. Embassy Tripoli Facebook page on Aug. 27, 2012, Christopher Stevens (left), U.S. Ambassador to Libya, shakes hands with a Libyan man in Tripoli, Libya. (Associated Press/U. S. Embassy Tripoli)

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**FILE** In this photo posted on the U.S. Embassy Tripoli Facebook page on Aug. 27, 2012, Christopher Stevens (left), U.S. Ambassador to Libya, shakes hands with a Libyan man in Tripoli, Libya. (Associated Press/U. S. Embassy Tripoli)