Protesters mass in central Cairo on January 29.
Protesters form a human chain around a Republican Guard tank in Cairo's Tahrir Square on January 29.
Demonstrators celebrate atop an army tank in Tahrir Square during protests in Cairo on January 29.
Soldiers confront riot police as protesters take cover in Tahrir Square in downtown Cairo on January 29.
Protesters run for cover as police fire on crowds near a central square in Cairo on January 29.
Demonstrators chant slogans in front of army tanks stationed near the National Museum in downtown Cairo on January 29.
A soldier stands guard beside an armored vehicle with the slogan "Down Mubarak" painted on it.
A civilian kisses an army soldier after troops took positions at major junctions in central Cairo on January 29.
A demonstrator throws a stone from atop an armored vehicle in central Cairo on January 29.
Demonstrators wave the national flag atop an armored vehicle deployed outside the national television building in Cairo.