An explosion Tuesday ripped through the Palestinian refugee camp of Ain el Hilweh in southern Lebanon, killing one person and wounding foru others, Palestinian sources said.

The sources inside the camp said Ahmad Qassem was killed and four others were injured in an explosion near the camp's al-Nour Mosque, which is controlled by Islamists.

Shortly after the explosion, the sound of machinegun fire was heard across the camp.

For the past two weeks, members of the mainstream Fatah movement and others who belong to Jund al Sham, a fundamentlaist group with links to the terror network al-Qaeda, have clashed in the same area where the explosion took place.

There are some 12 refugee camps around Lebanon, but security inside the shanty towns are in hands of the Palestinian factions.