AFRICAN UNION (AU) investigators accused South Sudan’s president of sparking tribal rivalries and mass killings before and during the country’s civil war.

The report by the AU team led by former Nigerian president Olusegun Obasanjo said it had found mass graves of men from former vice-president Riek Machar’s Nuer tribe.

It accused President Salva Kiir of recruiting an irregular force from among his own Dinka tribe before the civil war in December 2013.