MONROVIA, Aug 24 (AFP) - Many civilians were killed and villages torched in a massacre in Nimba county north-east of Monrovia, a senior Liberian military official told AFP late Sunday. "I have received a report from our security officers that many villages there had burned down and that there have been lots of massacres," said General Benjamin Yeaten, deputy head of the government army. "My understanding is that there was a massacre but we are not exactly sure how many people have been killed, it could be a hundred, it could be a thousand," he added, without saying who...