Pro-government protesters (L) take cover behind an army tank during clashes with anti-government protesters outside the National Museum near Tahrir square in Cairo February 3, 2011. Anti-government protesters and supporters of President Hosni Mubarak clashed on Thursday near a central Cairo square in a re-run of overnight violence that killed six and wounded more than 800 people. REUTERS/Yannis Behrakis (EGYPT - Tags: CIVIL UNREST POLITICS)