An independent fact-finding mission will investigate reported mass killings in the Sudanese city of el-Fasher, the UN announced on Friday.
"There has been too much pretence and performance, and too little action" from the international community in the face of Sudan's devastating civil war, UN human rights chief Volker Türk said at an emergency meeting in Geneva.
"It must stand up against these atrocities - a display of naked cruelty used to subjugate and control an entire population," he added, and gave a stark warning to all those "fuelling and profiting" from the civil war.
More than 150,000 people have been killed and about 12 million have had no choice but to flee their homes.
As part of the investigations, experts will also seek to identify perpetrators in order to hold them to account.
