<b>Photos:</b> Thousands protest in Egypt

Egyptian Nobel Peace laureate and democracy advocate Mohamed ElBaradei is surrounded by supporters as he arrives to address demonstrators at Tahrir square in Cairo.  (Khaled Desouki/AFP/Getty Images)

Protesters shout anti-goverment slogans during a demonstration in Cairo.  (Asmaa Waguih/Reuters)

An Egyptian anti-government protester throws a traffic cone into a burning car in front of a burning police station near the pyramids in Giza, Egypt. The pyramids on the outskirts of Cairo, Egypt’s premier tourist site, were closed by the military to tourists.   (Victoria Hazou/AP)

Egyptians clash with riot police in Cairo during demonstrations demanding the ouster of President Hosni Mubarak .   (Mohammed Abed/AFP/Getty Images)

Protesters stand with a soldier as he waves an Egyptian flag on an army tank in Tahrir Square in Cairo.  (Peter Macdiarmid/Getty Images)

A wounded protester is helped away after clashes with riot police at a demonstration.  (Nasser Nasser/AP)

Anti-government protesters scatter after police fired tear gas at them during a demonstration in downtown Cairo.  (Nasser Nasser/AP)

A protester kicks a tear gas canister at a demonstration in Cairo.  (Nasser Nasser/AP)

A protester throws back a tear gas canister toward police at a demonstration in Cairo.  (Nasser Nasser/AP)

Police are engulfed by their own tear gas at a demonstration in Cairo.  (Nasser Nasser/AP)

Anti-government protesters light flares at at Tahrir Square in downtown Cairo.  (Asmaa Waguih/Reuters)

Anti-government protesters clash with police in downtown Cairo.  (Mohamed Abd El-Ghany/Reuters)

Egyptian demonstrators pray in central Cairo.  (Mohammed Abed/AFP/Getty Images)

Egyptian demonstrators clash with Egyptian police in central Cairo.  (Mohammed Abed/AFP/Getty Images)

Egyptian demonstrators clash with Egyptian police in central Cairo.  (Mohammed Abed/AFP/Getty Images)

Anti-government protesters clash with police in downtown Cairo.  (Mohamed Abd El-Ghany/Reuters)

Egyptian demonstrators protest in central Cairo to demand the ouster of President Hosni Mubarak and calling for reforms.   (Mohamed Abed/AFP/Getty Images)

Egyptian demonstrators protest in central Cairo amid tear gas fired by Egyptian police.  (Mohammed Abed/AFP/Getty Images)

An anti-government protester waves Egyptian flags during clashes with police in downtown Cairo.  (Amr Abdallah Dalsh/Reuters)

Egyptian demonstrators surround a water-cannon truck used by Egyptian police to disperse a protest in central Cairo.  (Mohammed Abed/AFP/Getty Images)

Anti-government protesters clash with police in downtown Cairo.  (Amr Abdallah Dalsh/Reuters)

A riot policeman jumps over the rear of a car near anti-government protesters in downtown Cairo.  (Amr Abdallah Dalsh/Reuters)

A boy carrying bread on his head runs away from a column of riot policeman during anti-government protests in downtown Cairo.  (Amr Abdallah Dalsh/Reuters)

Egyptian demonstrators clash with Egyptian police in central Cairo.  (Mohammed Abed/AFP/Getty Images)

Egyptian demonstrators protest near Egyptian police.  (Mohammed Abed/AFP/Getty Images)

Egyptian demonstrators clash with Egyptian police in central Cairo.  (Mohammed Abed/AFP/Getty Images)

Egyptian demonstrators clash with Egyptian police in central Cairo.  (Mohammed Abed/AFP/Getty Images)

Police use a water cannon against anti-government protesters in downtown Cairo.  (Amr Abdallah Dalsh/Reuters)

A wounded Egyptian demonstrator lies on the ground during clashes with Egyptian police.  (Mohammed Abed/AFP/Getty Images)

A protester scuffles with a riot policeman as he demonstrates in downtown Cairo.  (Mohammed Abu Zaid/AP)

Tear-gas smoke fired by Egyptian police is seen as demonstrators gather in central Cairo.  (Mohammed Abed/AFP/Getty Images)

A protester scuffles with a riot policeman as he demonstrates in downtown Cairo.  (Mohammed Abu Zaid/AP)

Protesters are confronted by riot police as they demonstrate in downtown Cairo.  (Mohammed Abu Zaid/AP)