The U.S. ambassador to Libya and three embassy staffers have been killed in an attack on the American consulate in the Libyan city of Benghazi. Christopher Stevens and three aides died of smoke inhalation after an angry mob set fire to the building in protest of an amateur anti-Muslim film produced in the United States. The film also sparked protests in Egypt, where demonstrators scaled the walls of the U.S. embassy in Cairo and burned the American flag. The film, called “Innocence of Muslims,” was funded by private donors and made by a director who has called Islam a “cancer.”