Members of a South Sudan tribe, previously targeted in an ethnic assault, killed 47 people in another revenge attack, escalating the tribal conflict.

Over 3 000 people have been killed in South Sudan’s brutal massacres last week in an explosion of ethnic violence forcing tens of thousands to flee.

Fighting between tribes in its troubled Jonglei state has led South Sudan to declare the area a disaster zone, pleading for help from relief agencies.

Armed Lou Nuer youths have marched on Pibor, home to the rival Murle people, who they blame for cattle raiding and have vowed to exterminate.