At least 16 people have been killed after rebels attacked south Sudan's army, shattering a ceasefire, officials say. Forces loyal to George Athor blew up two army trucks near the town of Fangak in Jonglei state, a southern military spokesman said. Mr Athor took up arms last year, alleging fraud in state elections, but signed a ceasefire last month. The clashes come as Southern Sudan prepares to secede from the north. Some 99% of southerners voted for independence in last month's referendum, according to official results announced this week. Southern army spokesman Philip Aguer said four soldiers and 12 rebels were killed but he feared that many more people had died. "We are still waiting for full details of the casualties," he said. When Mr Athor took up arms, the south accused him of being used by the north to stir up trouble and derail the referendum - charges denied by northern officials. Source: BBC