An anti-Islam film with mysterious background sparked a diplomatic crisis as protests rage across Muslim countries from Yemen to Morocco. In Libya, American ambassador Christopher Stevens was killed when a grenade hit the U.S. consulate in Benghazi. In Egypt, protesters tore down the American flag from the embassy and replaced it with a black Islamic flag. Here are photos as outraged Muslims take to the streets to demonstrate. AP Photo (3) ; AFP / Getty Images Young protesters taunt police near the U.S. embassy in Cairo. Thursday marks the third day of violence in Egypt. Khalil Hamra / AP Photo A protester flings back a tear-gas canister after police used the stinging clouds to push Egyptian demonstrators away Figfrom the American embassy. Nasser Nasser / AP Photo Protesters and police flung rocks and tear gas back and forth throughout the day as clashes escalated in Cairo. Khaled Desouki, AFP / Getty Images Tear gas billowed toward rioters as violent protests overtook the area around the American embassy in Cairo. Khaled Desouki, AFP / Getty Images An image of the late Ayatollah Khomeini peers from a poster held by an Iranian protester. Demonstrations in Tehran were held outside the heavily guarded Swiss embassy, which handles U.S. interests because of the lack of diplomatic relations between Iran and America. Vahid Salemi / AP Photo Angry demonstrators waved Islamic flags in front of the U.S. embassy in Tel Aviv. The anti-Islam film's director claimed to be Israeli to a Wall Street Journal reporter, but has been elusive, casting doubts on his background. Ariel Schalit / AP Photo An armchair and parasol float eerily in the swimming pool of the charred U.S. consulate in Benghazi, Libya. Libyan officials say they have arrested the people at fault for the death of the U.S. ambassador and three staffers. Gianluigi Guercia, AFP / Getty Images Demonstations in Yemen took a turn for the worse as protesters stormed the U.S. embassy. Government troops managed to drive them away with warning shots. Mohammed Huwais, AFP / Getty Images Protestors in Yemen climb the formidable gates protecting the U.S. embassy in Sana'a. Hani Mohammed / AP Photo A Yemeni man smashed an outside window of the U.S. embassy as protesters demonstrated against the anti-Islam film "The Innocence of Muslims." Hani Mohammed / AP Photo U.S. Marines arrived in Tripoli after the attack to secure the American consulate. Gianluigi Guercia, AFP / Getty Images Iranian women hold signs protesting against the recenly released film mocking the Prophet Muhammad. Demonstrators chanted "Death to America!" but peacefully dispersed two hours later. Atta Kenare, AFP / Getty Images Anti-Israel and anti-American protests spread across several Muslim nations in the wake of a film bashing Islam and the Prophet Muhammad. Atta Kenare, AFP / Getty Images Arab-Israeli Muslim men protested in front of the U.S. embassy in Tel Aviv on Thursday. Jack Guez, AFP / Getty Images A riot policeman walked by a burning car outside the U.S. embassy in Cairo as protests entered the third day. Hussein Tallal / AP Photo Egyptian protesters chanting anti-American slogans carried their flag and a flag in Arabic that reads "No God but Allah, and Mohammed is his prophet." Nasser Nasser / AP Photo An Egyptian soldier guards the U.S. embassy in Cairo on Wednesday. The Arabic on the wall reads, "anyone but God's prophet." Nasser Nasser / AP Photo President Barack Obama and Secretary of State Hillary Clinton addressed staff members in the courtyard of the US State Department in Washington, DC, after news that Libyan Ambassador Christopher Stevens and three staff members were killed at the consulate building in Benghazi. Paul J. Richards, AFP / Getty Images An American flag flies at half staff outside the State Department in Washington, DC. in honor of ambassador to Libya Christopher Stevens and three other consulate employees. Alex Wong / Getty Images Libyan civilians help an unconscious man, identified by eyewitnesses as Christopher Stevens, after the consulate compound in Benghazi was attacked overnight Tuesday. STR / AFP / Getty Images A vehicle smolders after being set on fire inside the American consulate compound in Benghazi late at night on September 11. STR / AFP / Getty Images An armed man waves his rifle as buildings and cars were set on fire inside the U.S. consulate compound in Benghazi late on September 11. STR / AFP / Getty Images Egyptian protesters climbed up to tear down the American flag and replace it with a black Islamic flag at the U.S. embassy in Cairo. AFP / Getty Images Thousands of demonstrators protested outside the U.S. embassy in Cairo. Here, an Egyptian stands above the entry of the embassy Khaled Desouki, AFP / Getty Images Protesters, many of whom are conservative Islamists, engulfed the American embassy in Cairo, chanting anti-America slogans in protest of a film degrading the Prophet Muhammad. Mohammed Abu Zaid / AP Photo