FILE - In this Monday, April 26, 2010 file photo, then Vice President Riek Machar, left, and President of South Sudan Salva Kiir, centre, arrive for a press conference in Juba, South Sudan. South Sudan will hold general elections between May and July 2015 and will give amnesty to rebels to encourage the widest participation in the elections, a government spokesman said Wednesday, Dec. 31, 2014, but a rebel spokesman rejected the polls and amnesty saying forces fighting the government have committed no crime. (AP Photo/Pete Muller, File)