A general view shows protesters at Tahrir Square as riot police and military fire tear gas, in Cairo November 23, 2011. Rocks, teargas, firebombs and gunfire made darkened streets in central Cairo a battle zone on Wednesday as hard-core protesters demanding an immediate end to army rule fought riot police around government buildings close to Tahrir Square. REUTERS/Amr Abdallah Dalsh (EGYPT – Tags: CIVIL UNREST POLITICS)