Rival militias clashed on the outskirts of the Libyan capital for a fourth day Sunday in the deadliest and most sustained violence since the capture and killing of Moammar Khadafy last month. Fighters attacked each other with rockets, mortars and machine guns, witnesses said. The fighting, which has killed at least 13 people since late last week, raised new concerns about the ability of Libya’s transitional government to disarm thousands of gunmen and restore order after an eight-month civil war.
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