More than 6,000 people were killed in just three days when Sudan's paramilitary Rapid Support Forces (RSF) seized the city of el-Fasher last year, according to victims and witnesses cited in a UN report.

"It was like a scene out of a horror movie," recalled one person, who saw bodies thrown into the air as RSF fighters opened fire on 1,000 people sheltering in a university building last October.

The report cites evidence of mass killings, summary executions, torture, abductions and sexual violence against civilians. These amount to war crimes and possible crimes against humanity, it says.

The RSF has not commented on the report but has denied previous such accusations.

Sudan remains locked in an almost three‑year power struggle between the regular army and the RSF paramilitaries. The ongoing civil war has killed hundreds of thousands of people, and forced more than 13 million people from their homes. Widespread sexual violence against men, women and children is being used as a weapon of war.