CAIRO — 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.

The Rapid Support Forces, or RSF, overran the city of el-Fasher, the capital of North Darfur state, in what the United Nations chief called a “terrible escalation” in the conflict.

Medical groups reported that RSF fighters have killed dozens of civilians and detained hundreds of others since taking over the military’s base in the city on Sunday.

The army said it withdrew from the city, hoping to save civilians from further violence after more than a year of RSF attacks on the city. Military chief Gen. Abdel-Fattah Burhan said

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