FILE - U.S. Ambassador Chris Stevens stands in the lobby of the Tibesty Hotel where an African Union delegation was meeting with opposition leaders in Benghazi, Libya in this April 11, 2011 file photo. Libyan officials say the U.S. ambassador and three other Americans have been killed in an attack on the U.S. consulate in the eastern city of Benghazi by protesters angry over a film that ridiculed Islam's Prophet Muhammad. (AP Photo/Ben Curtis, File)

Associated Press
FILE - U.S. Ambassador Chris Stevens stands in the lobby of the Tibesty Hotel where an African Union delegation was meeting with opposition leaders in Benghazi, Libya in this April 11, 2011 file photo. Libyan officials say the U.S. ambassador and three other Americans have been killed in an attack on the U.S. consulate in the eastern city of Benghazi by protesters angry over a film that ridiculed Islam's Prophet Muhammad. (AP Photo/Ben Curtis, File)
FILE - U.S. Ambassador Chris Stevens stands in the lobby of the Tibesty Hotel where an African Union delegation was meeting with opposition leaders in Benghazi, Libya in this April 11, 2011 file photo. Libyan officials say the U.S. ambassador and three other Americans have been killed in an attack on the U.S. consulate in the eastern city of Benghazi by protesters angry over a film that ridiculed Islam's Prophet Muhammad. (AP Photo/Ben Curtis, File)
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