BBC News with Jerry Smit. The United Nations Secretary General Ban Ki-moon has warned warring parties in South Sudan that they will be held to account for crimes against humanity. He once again called on President Salva Kiir and opposition leaders to hold talks. Nada Tawfik reports. The United Nations Secretary General Ban Ki-moon has said that the world is watching all sides in South Sudan. ___________________ BBC新闻,杰瑞`斯密特报道 联合国秘书长潘基文警告南苏丹交战各方,他们将为反人类罪承担责任.他再次呼吁总统萨尔瓦`基尔和反对派领导人举行会谈.娜妲`塔非克报道. 联合国秘书长潘基文表示全世界都在关注南苏丹的各方态势.__________________________________