埃及示威者挤满开罗解放广场要求变革
Egyptian protesters stand behind a barbed wire barricade in Tahrir Square in Cairo, November 24, 2011. (AP)
A woman protester attempts to dismantle a barbed wire barricade, newly erected by the Egyptian army, near Tahrir square in Cairo, November 24, 2011. (AP)
An Egyptian officer, left, attempts to talk to protesters behind a newly erected barbed wire barricade by the Egyptian army near Tahrir square in Cairo, November 24, 2011. (AP)
A protester holds tear gas canisters used by Egyptian riot police in Tahrir Square in Cairo, November 24, 2011. (AP)
An Egyptian vendor sells gas masks in Tahrir Square in Cairo, November 24, 2011. (AP)
An injured protester is treated by a doctor in Tahrir Square in Cairo, Egypt, November 24, 2011. (AP)
An injured protester wakes up in Tahrir Square in Cairo, Egypt, November 24, 2011. (AP)
A protester prays moments after waking up in Tahrir Square in Cairo, Egypt, November 24, 2011. (AP)