An Egyptian protester throws a teargas back during clashes between anti-government protesters and riot police near Tahrir square in Cairo, March 9, 2013. Two protesters were killed during the clashes. (Xinhua/Amru Salahuddien)

An Egyptian protester throws a teargas back during clashes between anti-government protesters and riot police near Tahrir square in Cairo, March 9, 2013. Two protesters were killed during the clashes. (Xinhua/Amru Salahuddien)

Egyptian protesters take cover from teargas during clashes between anti-government protesters and riot police near Tahrir square in Cairo, March 9, 2013. Two protesters were killed during the clashes. (Xinhua/Amru Salahuddien)