U.S. ambassador to Libya, three other Americans killed

The U.S. ambassador to Libya and three other Americans were killed after armed men stormed the U.S. diplomatic mission in the eastern city of Benghazi on Tuesday. Ambassador Chris Stevens died from injuries sustained in the attack.

Protesters destroy an American flag pulled down from the U.S. embassy in Cairo, Egypt, Tuesday, Sept. 11, 2012. Egyptian protesters, largely ultra conservative Islamists, have climbed the walls of the U.S. embassy in Cairo, went into the courtyard and brought down the flag, replacing it with a black flag with Islamic inscription, in protest of a film deemed offensive of Islam. (AP Photo/Mohammed Abu Zaid)

Protesters destroy an American flag pulled down from the U.S. embassy in Cairo, Egypt, Tuesday, Sept. 11, 2012. Egyptian protesters, largely ultra conservative Islamists, have climbed the walls of the U.S. embassy in Cairo, went into the courtyard and brought down the flag, replacing it with a black flag with Islamic inscription, in protest of a film deemed offensive of Islam. (AP Photo/Mohammed Abu Zaid)

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