A doctors group and the United Nations say fighters from the notorious paramilitary Rapid Support Forces ran riot in east-central Sudan in a multi-day attack that killed more than 120 people in one town.

A senior UN official in Sudan says she is deeply troubled by reports of "atrocious crimes" in the central Gezira state, including the mass killing of civilians by the paramilitary Rapid Support Forces (RSF).

The attack in east-central Sudan was the Rapid Support Forces’ latest against the Sudanese military after it suffered a series of setbacks

At least 50 people have been killed in a single attack by Sudanese paramilitaries who have besieged and raided villages in al-Jazira state, activists said.