An explosion went off Monday in the home of an Islamic Jihad operative, killing him and wounding 20 others, including children, Palestinian security officials said. Palestinian security officials identified the dead man as 30-year-old Alla al-Hesi. The blast took place in the crowded Shati refugee camp on the outskirts of Gaza City. The officials said the cause of the blast wasn't immediately known, but raised the possibility that the operative had mishandled explosives. The blast went off near the UN's food distribution warehouse.