Pro and anti-government protesters throw stones during clashes near Tahrir Square in Cairo, Egypt, January 30, 2013.

Egyptian riot police arrest a man during clashes with protesters near Tahrir Square in Cairo, Egypt, January 30, 2013.

Protesters celebrate the capture of a state security armored vehicle that demonstrators commandeered during clashes with security forces and brought to nearby Tahrir Square in Cairo, Egypt, January 28, 2013.

Protesters use camera phones to capture a burning state security armored vehicle that demonstrators commandeered, brought to Tahrir Square and set alight, Cairo, Egypt, January 28, 2013.

Egyptian riot police clash with protesters, not seen, near Tahrir Square, Cairo, Egypt, January 27, 2013.

Egyptians carry the coffin of a man killed protests a day earlier in Port Said, Egypt, January 27, 2013.

Smoke rises after Egyptian protesters clash with police, unseen, in Port Said, Egypt, January 27, 2013.

A riot police officer gestures during clashes with protesters opposing Egyptian President Mohamed Morsi throwing stones at him near Tahrir Square, Cairo, Egypt, January 25, 2013.

A protester opposing Egyptian President Mohamed Morsi throws a tear gas canister, earlier thrown by riot police near Tahrir Square, Cairo, Egypt, January 25, 2013.

Protesters opposing Egyptian President Mohamed Morsi throw stones towards riot police during clashes near Tahrir Square, Cairo, Egypt, January 25, 2013.