Egyptian army tanks secure the perimeter of the presidential palace while protesters gather chanting anti president Mohammed Morsi slogans, in Cairo, Egypt, Friday, Dec. 7, 2012. Thousands of Egyptians took to the streets after Friday midday prayers in rival rallies and marches across Cairo, as the standoff deepened over what opponents call the Islamist president's power grab, raising the specter of more violence. (AP Photo/Nasser Nasser)
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