A man looks at documents at the U.S. consulate in Benghazi, Libya, after an attack that killed four Americans, including Ambassador Chris Stevens, Wednesday, Sept. 12, 2012. The graffiti reads, "no God but God," "God is great," and "Muhammad is the Prophet." The American ambassador to Libya and three other Americans were killed when a mob of protesters and gunmen overwhelmed the U.S. Consulate in Benghazi, setting fire to it in outrage over a film that ridicules Islam's Prophet Muhammad. (AP Photo/Ibrahim Alaguri)

Photo by: Ibrahim Alaguri

A man looks at documents at the U.S. consulate in Benghazi, Libya, after an attack that killed four Americans, including Ambassador Chris Stevens, Wednesday, Sept. 12, 2012. The graffiti reads, "no God but God," "God is great," and "Muhammad is the Prophet." The American ambassador to Libya and three other Americans were killed when a mob of protesters and gunmen overwhelmed the U.S. Consulate in Benghazi, setting fire to it in outrage over a film that ridicules Islam's Prophet Muhammad. (AP Photo/Ibrahim Alaguri)