A protester opposing Egyptian President Mohamed Mursi throws a stone at riot police during clashes, along Qasr Al Nil bridge, which leads to Tahrir Square in Cairo January 27, 2013. Egyptian President Mohamed Mursi announced on Sunday he was imposing a state of emergency for 30 days in three cities along the Suez Canal that have been the scene of the worst violence that flared at the weekend, killing more than 45 people. REUTERS/Amr Abdallah Dalsh (EGYPT - Tags: POLITICS CIVIL UNREST)