The African Union’s chief mediator in talks to end the conflict in Sudan’s Darfur region warned a recalcitrant rebel leader on Monday he would become irrelevant unless he signed a peace deal. Mediator Salim Ahmed Salim was speaking before the AU’s Peace and Security Council met to discuss a May 5 peace deal between Khartoum and Minni Arcua Minnawi, leader of the biggest faction of the rebel Sudan Liberation Army (SLA). Full Story