Egyptian army engineers build a cement clock barrier securing the perimeter of the presidential palace, background, as protesters opposed to President Mohammed Morsi gather in Cairo, Egypt, Saturday, Dec. 8, 2012. Egypt's military warned Saturday of 'disastrous consequences' if the crisis that sent tens of thousands of protesters back into the streets is not resolved, signaling the army's return to an increasingly polarized and violent political scene.(AP Photo/Hassan Ammar)

Associated Press
Egyptian army engineers build a cement clock barrier securing the perimeter of the presidential palace, background, as protesters opposed to President Mohammed Morsi gather in Cairo, Egypt, Saturday, Dec. 8, 2012. Egypt's military warned Saturday of 'disastrous consequences' if the crisis that sent tens of thousands of protesters back into the streets is not resolved, signaling the army's return to an increasingly polarized and violent political scene.(AP Photo/Hassan Ammar)
Egyptian army engineers build a cement clock barrier securing the perimeter of the presidential palace, background, as protesters opposed to President Mohammed Morsi gather in Cairo, Egypt, Saturday, Dec. 8, 2012. Egypt's military warned Saturday of 'disastrous consequences' if the crisis that sent tens of thousands of protesters back into the streets is not resolved, signaling the army's return to an increasingly polarized and violent political scene.(AP Photo/Hassan Ammar)
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