Heavy clashes erupted late Friday between a Sunni fundamentalist group and fighters of the mainstream Fatah faction in a Palestinian refugee camp in southern Lebanon, prompting civilians to flee the area, according to Deutsche Presse Agentur dpa. The rival fighters exchanged rocket fire in the main street of the densely populated Ain al-Hilweh camp outside the southern city of Sidon, a security official told DPA. The clashes started as skirmishes in the morning after militants of Jund al-Sham (Soldiers of Damascus) were angered after Fatah's seized a commander of the group and handed him over to the Lebanese Army. There was no immediate word on any casualties from Friday's clashes.