Two Lebanese army explosives experts were killed and another seriously wounded Wednesday trying to defuse an unexploded artillery shell leftover from the war in southern Lebanon, security officials said. The ordnance exploded as the soldiers tried to dismantle it near the village of Aita al-Jabal near the border with Israel, security officials said. The officials refused to be identified because they are not authorized to talk to the media. One of the soldiers was killed immediately and another was taken to a nearby hospital where succumbed to his wounds. The third casualty was reported in critical condition in the same hospital, the security officials said.