A huge crowd gathers in Tahrir or Liberation Square in Cairo, Egypt, Tuesday, Feb. 1, 2011. More than a quarter-million people flooded into the heart of Cairo Tuesday, filling the city's main square in by far the largest demonstration in a week of unceasing demands for President Hosni Mubarak to leave after nearly 30 years in power. (AP Photo/Tara Todras-Whitehill)

Photo by: Tara-Todras Whitehill

A huge crowd gathers in Tahrir or Liberation Square in Cairo, Egypt, Tuesday, Feb. 1, 2011. More than a quarter-million people flooded into the heart of Cairo Tuesday, filling the city's main square in by far the largest demonstration in a week of unceasing demands for President Hosni Mubarak to leave after nearly 30 years in power. (AP Photo/Tara Todras-Whitehill)