Protesters throw stones at Egyptian riot police during clashes in Tahrir Square in Cairo, Egypt, Saturday, Nov. 19, 2011. Thousands of police clashed with protesters for control of downtown Cairo's Tahrir Square on Saturday after security forces tried to stop activists from staging a long-term sit-in there. The violence took place just nine days before Egypt's first elections since the ouster of longtime President Hosni Mubarak in February. Photo by Ahmed Asad