KINSHASA (Reuters) - Nearly 1,000 inmates escaped from a high security prison in Democratic Republic of Congo's top mining town Lubumbashi on Wednesday after gunmen attacked it to free a jailed rebel leader, the local government said. One policeman and a visitor were killed in the attack, during which former rebel commander Gedeon Mutanga and the rest of the prisoners escaped, according to the provincial minister of interior, Jean Marie Dikanga Kazadi. "When the assailants came they started by firing on the guards and the police," he told Reuters by telephone from Lubumbashi.