The Rapid Support Forces militia reportedly killed hundreds of civilians at the main hospital in el-Fasher, days after it captured the Sudanese city, the head of the UN's health agency says, BBC reported.

Tedros Adhanom Ghebreyesus said the UN health agency was "appalled and deeply shocked" by the reported killing of 460 people at the hospital.

Earlier, the Sudan Doctors' Network said that on Tuesday RSF fighters had "cold bloodedly killed everyone they found inside the Saudi Hospital, including patients, their companions, and anyone else present".

It gave no casualty figures, but said medical facilities in the city had been "transformed into human slaughterhouses".