Pro-government demonstrators, bottom, clash with anti-government demonstrators, top right, as a palm tree burns from a firebomb, in Tahrir Square, the center of anti-government demonstrations, in Cairo, Egypt, early Thursday, Feb. 3, 2011. (AP Photo/Lefteris Pitarakis)

Photo by: Lefteris Pitarakis

Pro-government demonstrators, bottom, clash with anti-government demonstrators, top right, as a palm tree burns from a firebomb, in Tahrir Square, the center of anti-government demonstrations, in Cairo, Egypt, early Thursday, Feb. 3, 2011. (AP Photo/Lefteris Pitarakis)