Boys sit on an army tank during a protest against Libyan leader Muammar Gaddafi in Benghazi February 26, 2011. Libya's rebel-held city of Benghazi has filled a political void with a coalition which is cleaning up, providing food, building defences, reassuring foreign oil firms and telling Tripoli it believes in one nation. REUTERS/Suhaib Salem (LIBYA - Tags: POLITICS CIVIL UNREST IMAGES OF THE DAY)