A protester throws a tear gas canister back at riot police during 

A protester throws a tear gas canister back at riot police during clashes near Tahrir Square, in Cairo, Sunday, Jan. 27, 2013. Clashes continued for the fourth successive day between protesters and police near Tahrir square, birthplace of the 2011 uprising. Police used tear gas, while the protesters pelted them with rocks. (AP Photo/Khalil Hamra)
Associated Press
A protester throws a tear gas canister back at riot police during clashes near Tahrir Square, in Cairo, Sunday, Jan. 27, 2013. Clashes continued for the fourth successive day between protesters and police near Tahrir square, birthplace of the 2011 uprising. Police used tear gas, while the protesters pelted them with rocks. (AP Photo/Khalil Hamra)
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