An Egyptian protester prepares to hurl a tear gas canister back at security forces as others run for cover earlier today in Cairo's Tahrir Square. Mohammed Hossam /AFP/Getty Images hide caption

itoggle caption Mohammed Hossam /AFP/Getty Images

Secretary of State Hillary Clinton (in red) shook hands with a child as she visited Cairo's Tahrir Square earlier today (March 16, 2011). Paul J. Richards /AFP/Getty Images hide caption

itoggle caption Paul J. Richards /AFP/Getty Images