At least 250 people drowned as they fled a town in South Sudan where they had been alerted rebel forces were expected to attack. The report of an imminent attack was later found to be false, China's official Xinhua news agency reported Monday. Upper Nile State information minister Philip Jiben said the deaths occurred when a boat carrying people from the town of Malakal sank. Jiben said only two children were rescued. He said the people had fled the town after receiving reports the forces of former vice president Riek Machar were going to attack , but no attack was launched. " Machar is engaged in a conflict with the forces of South Sudan President Salva Kiir Mayardit. The two sides are meeting in Ethiopia to negotiate a ceasefire.