The break away of Riek Machar from SPLM/A resulted in Nuer ethnic group massacring Garang's ethnic Dinka from Bor in the Bor massacre in 1991.
The split of Riek Machar from SPLM/A triggered a retaliatory attack by the Nuer ethnic group on the Dinka inhabitants of Bor, resulting in the devastating Bor massacre in 1991.