Tensions escalate in Egypt
Egyptian riot police stand guard behind barbed wire while protesters chant anti Muslim Brotherhood slogans, not pictured, during a demonstration in front of the presidential palace, in Cairo, Egypt, Tuesday, Dec. 4, 2012. Thousands of Egyptians massed in Cairo Tuesday for a march to the presidential palace to protest the assumption by the nation's Islamist president of nearly unrestricted powers and a draft constitution hurriedly adopted by his allies. (AP Photo/Nasser Nasser)