A protester opposed to leader Muammar Gaddafi chants slogans in front of a Libyan army tank in the city of Zawiyah February 27, 2011. Armed men opposed to the rule of Libyan leader Gaddafi were in control of the city of Zawiyah, 50 km (30 miles) west of the capital Tripoli, on Sunday. REUTERS/Ahmed Jadallah (LIBYA - Tags: POLITICS CIVIL UNREST)