"I am utterly shocked by the credible reports of multiple summary executions of civilians in areas of Khartum", says Volker Turk in a statement.
The paramilitary RSF forces, led by Mohamed Hamdan Daglo, have been fighting against the military since April 2023. Last week, the military announced that it had retaken the capital after weeks of attacks from RSF, but Daglo claimed that his forces had only been "repositioned".
"I urge the commanders of the Sudanese armed forces to take immediate action to put an end to arbitrary deprivation of life", says Turk.
According to the statement, his office has reviewed videos showing armed men "cold-bloodedly executing civilians". In some of the films, the perpetrators claim to be punishing RSF supporters.