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AIN EL-HILWEH, Lebanon (Reuters) - A Palestinian security force deployed into an area of a refugee camp in southern Lebanon where it had been battling Sunni Islamist militants, ending six days of lethal clashes on Wednesday, a Reuters witness said.

The clashes at Ain el-Hilweh refugee camp on the outskirts of the southern Lebanese city of Sidon have killed seven people.

The violence began on Friday when the joint Palestinian security force sought to deploy throughout the camp and met resistance from the Sunni Islamist Badr group.

The joint security force comprises the main Palestinian factions including Fatah, led by the West Bank-based Palestinian President Mahmoud Abbas.