Police gather in Tahrir Square as a car burns on January 28, 2011 in Cairo, Egypt. Getty Images / Peter Macdiarmid

Egyptian army armored vehicle are seen outside the television building following protests in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Victoria Hazou

Protestors attempt to get into Tahrir Square on January 28, 2011 in downtown Cairo, Egypt. Getty Images / Peter Macdiarmid

Egyptian anti-government activists chant slogans as they confront riot police during a protest on the May 15 bridge in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Khalil Hamra

Egyptian riot police disperse demonstrators in Cairo on January 28, 2011, demanding the ouster of President Hosni Mubarak. AFP/ Getty Images / Marco Longari

Egyptian plain cloth police officers arrest a demonstrator in Cairo on January 28, 2011, demanding the ouster of President Hosni Mubarak. AFP/ Getty Images / Marco Longari

Egyptian women pray behind a row of riot police ahead of demonstrations in Cairo on January 28, 2011, demanding the ouster of President Hosni Mubarak. AFP/ Getty Images / Marco Longari

Egyptian anti-government activists, some standing on a burned police car challenge riot police officers, not seen, during clashes in Cairo, Egypt, Friday Jan. 28, 2011. AP / Lefteris Pitarakis

Egyptian protesters face anti-riot policemen in Cairo, Egypt, Friday, Jan. 28, 2011. The Egyptian capital Cairo was the scene of violent chaos Friday, when tens of thousands of anti-government protesters stoned and confronted police, who fired back with rubber bullets, tear gas and water cannons. AP / Victoria Hazou

Egyptian protesters jump over anti-riot vehicles in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Ahmed Ali

Egyptian anti-government activists carry a wounded man during clashes with the police in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Ben Curtis

Egyptian anti-government activists protest in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Ben Curtis

Egyptian anti-government activists demonstrate after the police, seen in their vehicles, moved back following clashes in Cairo, Egypt, Friday, 28, 2011. AP / Lefteris Pitarakis

An Egyptian anti-government activist tries to avoid the effect of tear gas launched by riot police officers, not seen, during clashes in downtown Cairo, Egypt, Friday, Jan. 28, 2011. AP / Lefteris Pitarakis

An Egyptian anti-government activist runs to throw back a tear gas canister fired by riot police officers, not seen, during clashes in Cairo, Egypt, Wednesday, Jan. 26, 2011. AP / Lefteris Pitarakis

An Egyptian protester throws stones towards a line of riot police in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Victoria Hazou

Egyptian protesters flee as riot police charge towards them in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Victoria Hazou

Egyptian anti-government activists affected by the tear gas react during clashes with police in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Ben Curtis

An Egyptian police officer, top left, gives the thumbs-up as Egyptian anti-government activists walk past riot police officers inside their van as police pulled back following riots with protesters in Cairo, Egypt, Friday, 28, 2011. AP / Lefteris Pitarakis

People try to extinguish a police car on fire during clashes between Egyptian anti-government activists and the police in Cairo, Egypt, Friday, 28, 2011. AP / Lefteris Pitarakis

Egyptian anti-government activists run for a cover from the tear gas during clashes with the riot police in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Ben Curtis

Egyptian anti-government activists are seen atop police trucks during clashes with police in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Ben Curtis

An Egyptian demonstrator confronts riot police during demonstrations in Cairo on January 28, 2011, demanding the ouster of President Hosni Mubarak. AFP/ Getty Images / Khaled Desouki

An Egyptian police officer fire tear gas at demonstrators in Cairo on January 28, 2011, demanding the ouster of President Hosni Mubarak. AFP/ Getty Images / Khaled Desouki

Police carry an injured colleague across the Kasr Al Nile Bridge on January 28, 2011 in downtown Cairo, Egypt. Getty Images / Peter Macdiarmid

Egyptian demonstrators confront riot police during demonstrations in Cairo on January 28, 2011, demanding the ouster of President Hosni Mubarak. AFP/ Getty Images / Khaled Desouki

Riot police force protestors back across the Kasr Al Nile Bridge as they attempt to get into Tahrir Square on January 28, 2011 in downtown Cairo, Egypt. Getty Images / Peter Macdiarmid

Riot police fire water cannons at protestors attempting to cross the Kasr Al Nile Bridge on January 28, 2011 in downtown Cairo, Egypt. Getty Images / Peter Macdiarmid

Riot police force protestors back across the Kasr Al Nile Bridge as they attempt to get into Tahrir Square on January 28, 2011 in downtown Cairo, Egypt. Getty Images / Peter Macdiarmid

Protestors climb on a retreating police tear gas vehicle on the Kasr Al Nile Bridge as they attempt to get into Tahrir Square on January 28, 2011 in downtown Cairo, Egypt. Getty Images / Peter Macdiarmid

Riot police face protestors on the Kasr Al Nile Bridge on January 28, 2011 in downtown Cairo, Egypt. Getty Images / Peter Macdiarmid

Egyptian protesters flee as anti-riot police fire tear gas in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Ahmed Ali

Egyptian anti-riot police clash with antigovernment protesters in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Muhammed Abu Zaid

A Egyptian protesters shout in front of anti-riot policemen who block a bridge in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Ahmed Ali

Egyptian anti-riot policemen use water canons against protesters in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Muhammed Abu Zaid

A protestor gestures to riot policeman in front of the l-Istiqama Mosque in Giza on January 28, 2011 in Cairo, Egypt. Getty Images / Peter Macdiarmid

Egyptian demonstrators confront riot police during a demonstration in Cairo on January 28, 2011, demanding the ouster of President Hosni Mubarak. AFP/ Getty Images / Mohammed Abed

Locals pray in the street in front of The l-Istiqama Mosque watched by riot police in Giza on January 28, 2011 in Cairo, Egypt. Getty Images / Peter Macdiarmid

An Egyptian anti-government activist kisses a riot police officer following clashes in Cairo, Egypt, Friday, Jan. 28, 2011. AP / Lefteris Pitarakis