A cluster bomb exploded in south Lebanon on Friday, killing a member of Hizbullah and wounding another, Lebanese security officials said. Mohammed Rizk, 20, was dismantling a cluster bomb in the village of Arnoun near the market town of Nabatiyeh when it exploded, killing him instantly. Another man, 18-year-old Mustafa Ajami, was wounded, said the officials on condition of anonymity because they were not allowed to speak to the press. Ajami was taken to a nearby hospital for treatment. A Hizbullah official in southern Lebanon confirmed that Rizk was a member of the guerrilla group, which fought a 34-day war against Israeli troops this summer. The United Nations and human rights groups have accused Israel of firing as many as 4 million cluster bombs into Lebanon during the war that ended in a UN-brokered cease-fire on Aug. 14. UN de-mining experts say up to 1 million of the cluster bombs failed to explode and continue to threaten civilians, especially children who can mistake the ordnance for batteries or other small objects. Friday's death brings to at least 24 the number of people who have died in cluster bomb explosions in Lebanon since the war ended. More than 100 people have been wounded.