epa03994859 (FILE) A file picture dated 30 May 2011 shows former South Sudanese vice president Riek Machar speaking during a press conference in Khartoum, Sudan. According to UN reports on 18 December 2013, between 400 and 500 people have been killed in violence this week between army units in South Sudan, as Riek Machar, the former vice president accused of leading the mutinous soldiers, denied in a newspaper interview that he was behind a coup attempt. EPA/PHILIP DHIL *** Local Caption *** 02759698