BEIRUT, May 7 (Xinhua)-- At least one Palestinian shot dead on Monday in a clash between rival factions at a Palestinian refugee camp in southern Lebanon, security sources said.

    The sources said that the clashes erupted at Ein el-Hilweh camp, which is located in Sidon, the provincial capital of southern Lebanon, after two groups of the Muslim militants opened fire, leaving at least one dead and another wounded.

    The dead Palestinian is a militant from Fatah movement of Palestinian President Mahmoud Abbas. He was ambushed after he arrived to pick up his motorcycle at the scene, the sources added.

    Other media reported that the attackers belonged to Jund al-Sham, an Islamic militant group based in the refugee camp in southern Lebanon.

    According to other media report, two Fatah militants were killed in the clashes, one was instantly killed and the other was seriously wounded and later died in hospital. But the motive for the clashes was not immediately clear at the moment.

    Ein el-Hilweh camp is the largest of Lebanon's 12 Palestinian refugee camps, home to some 400,000 Palestinian refugees. There are frequently gunfights between armed groups in the camp.