A security official says Yemeni warplanes have killed 80 anti-government tribesmen who overran part of a military camp in the Arhab region north of the capital Sanaa. The official said Saturday that warplanes and artillery had pounded the armed tribesmen for the past 48 hours. He spoke on condition of anonymity because he was not authorized to brief the media. There was no independent confirmation of the number of deaths. But a soldier from Yemen's 63rd Brigade who fled the camp says tribesmen had overrun it several days ago. He spoke by telephone from Arhab, asking not to be identified for fear of government reprisal.