FILE—In this file photo of Wenesday Oct. 13 2010, Dr. Riek Machar, former Vice President of the Government of South Sudan, presides over an all-southern-parties meeting in Juba, Sudan, Sporadic gunfire rang out early Monday in the South Sudan capital, Juba, in what a senior military official said were clashes between factions of the country’s military.There has been political tension in the world’s youngest nation since South Sudan President Salva Kir sacked Riek Machar as his deputy in July. The local Sudan Tribune newspaper reported on its website that clashes erupted late Sunday between members of the presidential guard in fighting that seemed to pit soldiers from Kiira’s Dinka tribe against those from the Nuer tribe of Machar. (AP Photo Pete Muller-File)