Egyptian protesters run for cover as they clash with security forces at Tahrir Square in Cairo on November 21, 2011. Khaled Desouki / AFP-Getty Images An injured Egyptian protester is helped away during clashes with security forces on the third day at Tahrir Square in Cairo on November 21, 2011. Khaled Desouki / AFP-Getty Images Egyptian protesters shout slogans against the ruling military council at Tahrir Square, Cairo, Egypt, on Monday, Nov. 21, 2011. Security forces fired tear gas and clashed Monday with several thousand protesters in Cairo's Tahrir Square in the third straight day of violence that has killed dozens of people and has turned into the most sustained challenge yet to the rule of Egypt's military. Amr Nabil / AP Photo An Egyptian protester waves the national flag at Tahrir Square, the focal point of the recent Egyptian uprising in Cairo, Egypt, Monday, Nov. 21, 2011. Amr Nabil / AP Photo A protester overcome with tear gas inhalation kneels in the middle of the street during clashes with the Egyptian riot police, not seen, near the interior ministry in downtown Cairo, Egypt, Sunday, Nov. 20, 2011. Tara Todras-Whitehill / AP Photo Egyptian protesters run for cover during clashes with riot police at Cairo's landmark Tahrir Square on November 20, 2011. Several hundred Egyptians occupied Cairo's Tahrir Square with sporadic clashes between protesters and the police following a night of deadly violence, an AFP correspondent said. Khaled Desouki / AFP-Getty Images A protester throws a gas canister towards Egyptian riot police, not seen, near the interior ministry during clashes in downtown Cairo, Egypt, Sunday, Nov. 20, 2011. Firing tear gas and rubber bullets, Egyptian riot police on Sunday clashed for a second day with thousands of rock-throwing protesters demanding that the ruling military quickly announce a date to hand over power to an elected government. Tara Todras-Whitehill / AP Photo Egyptian riot police clash with protesters in Tahrir Square in Cairo, Egypt, Saturday, Nov. 19, 2011. The military tolerates daytime demonstrations in the central square, a symbol of the country's Jan. 25-Feb. 11 uprising, but claims that long-term occupation paralyzes the city. Khalil Hamra / AP Photo Tens of thousands of Egyptian protesters wave flags as they flood Cairo's Tahrir Square on November 18, 2011, in opposition of Egypt's ruling military. Khaled Desouki / AFP-Getty Images