Soldiers stand guard on top a tank in front of the presidential palace in Cairo, Egypt, Sunday, Dec. 9, 2012. Egypt's liberal opposition called for more protests Sunday, seeking to keep up the momentum of its street campaign after the president made a partial concession overnight but refused its main demand he rescind a draft constitution going to a referendum on Dec. 15. (AP Photo/Petr David Josek)

Associated Press
Soldiers stand guard on top a tank in front of the presidential palace in Cairo, Egypt, Sunday, Dec. 9, 2012.  Egypt's liberal opposition called for more protests Sunday, seeking to keep up the momentum of its street campaign after the president made a partial concession overnight but refused its main demand he rescind a draft constitution going to a referendum on Dec. 15. (AP Photo/Petr David Josek)
Soldiers stand guard on top a tank in front of the presidential palace in Cairo, Egypt, Sunday, Dec. 9, 2012. Egypt's liberal opposition called for more protests Sunday, seeking to keep up the momentum of its street campaign after the president made a partial concession overnight but refused its main demand he rescind a draft constitution going to a referendum on Dec. 15. (AP Photo/Petr David Josek)
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