Sudan's paramilitary Rapid Support Forces (RSF) has been trying to cover up mass killings in the city of el-Fasher by burying and burning bodies, a research team from Yale University says.

The RSF had drawn international condemnation amid reports of executions and crimes against humanity when its fighters captured the city in October.

Now, analysis of satellite images by Yale's Humanitarian Research Lab (HRL) shows the RSF likely disposed of tens of thousands of bodies after seizing el-Fasher.

The RSF has not responded to the report, but its leader previously admitted his fighters had committed some violations in the city.

The HRL's report said the RSF "engaged in a systematic multi-week campaign to destroy evidence of its widespread mass killings" and "this pattern of body disposal and destruction is ongoing".