FILE - In this file photo of Monday, April 26, 2010, former South Sudan Vice President ,Riek Machar, left, President of South Sudan Salva Kiir, arrive during a press conference in Juba, South Sudan. Soldiers loyal to a former vice president attempted to overthrow the government of South Sudan, the country's president said Monday, as sporadic fighting between factions of the military gripped the capital in the latest violence to hit the world's youngest nation.(AP Photo/Pete Muller-File)