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By Feras Bosalum and Ulf Laessing TRIPOLI (Reuters) - Heavy fighting broke out between rival militias vying for control of Libya's main airport on Sunday, killing at least three people and forcing a halt of all flights in the worst fighting in the capital for six months. Residents said that Zintan militiamen who had controlled the airport came under fire and local TV footage suggested that the attacking rebels were from the western city of Misratis. The fighting is part of growing turmoil in the North African oil producer where the government is unable to control battle-hardened militias who helped to overthrow Muammar Gaddafi in 2011 but continue to defy state authority. Zintan forces from the northwest, which have controlled the airport since Gaddafi's ousting, and Misratis had been put on the state payroll in an unsuccessful attempt by the government to win their cooperation and establish the rule of law.