A protester covers his face as he stands in front of tear gas during clashes with riot police along a road at Kornish El Nile which leads to the U.S. embassy, near Tahrir Square in Cairo September 15, 2012. Clashes near the U.S. Embassy in central Cairo between police and Egyptians incensed over a film denigrating the Prophet Mohammad entered their fourth day early on Saturday, leaving one protester dead and dozens more injured. REUTERS/Amr Abdallah Dalsh (EGYPT - Tags: POLITICS CIVIL UNREST RELIGION)