Young Egyptian protesters look through a crack in a barrier towards security forces, unseen, as skirmishes break out, near Tahrir Square, Cairo, Egypt, Friday, Jan. 25, 2013. Egyptian opposition protesters are gathering in Cairo's Tahrir Square to mark the second anniversary of the uprising that toppled Hosni Mubarak's autocratic regime. (AP Photo/Thomas Hartwell)

Associated Press
Young Egyptian protesters look through a crack in a barrier towards security forces, unseen, as skirmishes break out, near Tahrir Square, Cairo, Egypt, Friday, Jan. 25, 2013. Egyptian opposition protesters are gathering in Cairo's Tahrir Square to mark the second anniversary of the uprising that toppled Hosni Mubarak's autocratic regime. (AP Photo/Thomas Hartwell)
Young Egyptian protesters look through a crack in a barrier towards security forces, unseen, as skirmishes break out, near Tahrir Square, Cairo, Egypt, Friday, Jan. 25, 2013. Egyptian opposition protesters are gathering in Cairo's Tahrir Square to mark the second anniversary of the uprising that toppled Hosni Mubarak's autocratic regime. (AP Photo/Thomas Hartwell)
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