The attack on Pibor follows reports last week that Lou Nuer fighters raided Lukangol , burning it to the ground and forcing thousands to flee toward Pibor . NEW : roughly 4,000 people are said to have fled from the violence in Jonglei . Information minister : Some of the roughly 4,000 who fled have started to return to Pibor . Earlier , an official said At least 50,000 reinforcements were being sent to South Sudan 's . The town had been under attack by fighters from a rival tribe .
NEW : roughly 4,000 people are said to have fled from the violence in Jonglei . Information minister : Some of the roughly 4,000 who fled have started to return to Pibor . Earlier , an official said At least 50,000 reinforcements were being sent to South Sudan 's . The town had been under attack by fighters from a rival tribe .