The United Nations is calling for urgent action to prevent large-scale, ethnically driven atrocities in El Fasher, the besieged capital of Sudan’s North Darfur state. On Thursday, the U.N.’s top human rights official warned at least 91 civilians were killed in El Fasher last month, as the paramilitary group Rapid Support Forces, or RSF, carried out artillery shelling, drone strikes and ground incursions. The U.N. also warned the RSF against starving civilians in El Fasher as a method of warfare, amid credible reports of civilians being tortured and killed by RSF fighters for bringing food and essential supplies into the city.