Photo Gallery: Unrest in Egypt: Dec. 15, 2012 10/14

Cars burn during clashes between supporters and opponents of President Mohammed Morsi in Alexandria, Egypt, Friday, Dec. 14, 2012, a day before the referendum on the constitution. Opposing sides in Egypt's political crisis were staging rival rallies on Friday, the final day before voting starts on a contentious draft constitution that has plunged the country into turmoil and deeply divided the nation.(AP Photo/Ahmed Ramadan ORG XMIT: CAI110