FILE -- In this Feb. 10, 2011 file photo, a flag is waved by anti-government protesters as they demonstrate in Tahrir Square in downtown Cairo, Egypt. Seven years ago, Cairo’s Tahrir Square was filled with tens of thousands of Egyptians demanding cha
FILE - In this April 27, 2012 file photo, protesters at a rally for Hazem Abu Ismail, a former candidate in the Egyptian presidential election, hold a banner reading "no US aid American," in Tahrir Square in Cairo, Egypt. Washington’s surprise decisi
As the world witnessed uprisings across the Arab world, ABC News' David Muir reported from Tahrir Square, the epicenter of clashes between protesters and supporters of former Egyptian President Hosni Mubarak during the 2011 Arab Spring.
Anti-government protesters in Cairo's Tahrir Square wave shoes in dismay as President Hosni Mubarak speaks to the nation, Feb. 10, 2011.
PHOTO: In this Jan. 28, 2013 photo, Egyptian protesters use camera phones to capture a burning state security armored vehicle that demonstrators commandeered during clashes and brought to Tahrir Square and set it alight, in Cairo, Egypt.
PHOTO: Ousted Egyptian president Hosni Mubarak sits inside a cage in a courtroom during his verdict hearing in Cairo, June 2, 2012. A judge sentenced Mubarak to life in prison after convicting him of involvement in the murder of protesters during the upri
VIDEO: Egypt's Tahrir Square fills with protesters following President Mohamed Morsi's power grab.
PHOTO: Egyptian protesters shout slogans in Tahrir Square as the country awaits the outcome of a presidential runoff vote in Cairo, Egypt, Saturday, June 23, 2012.
PHOTO: Egyptian protesters shout slogans at a protest in Tahrir Square, Cairo, Egypt, June 8, 2012.