Fasher, the capital of North Darfur state, in what the United Nations chief called a “terrible escalation” in the conflict.

Sudan's paramilitary Rapid Support Forces have taken the city of El Fasher, Darfur — trapping hundreds of thousands and stoking fears of mass killings.

Sudanese rebels have driven government forces from El Fasher, the last stronghold of the country’s regime in the western Darfur region, amid a brutal struggle for territory that has led to alleged genocide and contributed to one of the world’s most severe humanitarian crises.

Paramilitary fighters in vehicles, on camels and on foot rampaged through the Sudanese military's last stronghold in Darfur on Tuesday, killing and detaining hundreds of people in the latest atrocity of a war that has raged in Sudan for over 31 months.