JUBA — Mediators pushed hard for a ceasefire in South Sudan as fighting raged Sunday for the last rebel-held town and the full extent of the destruction wrought began to emerge. Envoys from the United States and South Sudan’s neighbors met Saturday with Riek Machar, leader of the rebel forces that have been fighting government troops for the past month. At least one east African envoy has flown back to South Sudan to hold talks with Kiir, diplomats said. Meanwhile the Satellite Sentinel Project, co-founded by Hollywood star George Clooney, released images detailing destruction to homes and markets in two towns, Mayom in oil-rich Unity and Bor, the Jonglei state capital, which government forces are trying to take back from rebels for the second time in a month. — AFP