GENEVA — Groups of gunmen who reportedly killed at least 460 people at a hospital in Sudan attacked in several waves, abducting doctors and nurses, then gunning down staff, patients and people sheltering there, the World Health Organization said Friday.

The attack Tuesday in the country's Darfur region was part of a reported rampage by the Rapid Support Forces, a powerful paramilitary group, as it captured the key city of el-Fasher after besieging it for 18 months. Witnesses have reported fighters going house-to-house, killing civilians and committing sexual assaults.

Many details of the hospital attack and other violence in the city have been slow to emerge, and the total death toll remains unknown.

The fall of el-Fasher heralds a new phase of the brutal, two-year war between the RSF a

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