United Nations experts have urged Malian authorities to investigate reports of alleged summary executions and forced disappearances by the army and Russian mercenaries.

According to a statement from the U.N. humanitarian agency, the bodies were found near the Kwala military camp in western Mali’s Koulikoro region between April 21 and 22, and are suspected to be those of men arrested by Malian soldiers and mercenaries from the Russia-backed Wagner Group ten days earlier.

Citing “unconfirmed reports,” the agency said around 60 men, most of them ethnic Fulani, were allegedly tortured and interrogated at the camp about alleged links with “terrorists,” before being executed.

The Associated Press has not been able to independently verify the reports. Spokespeople for Mali’s military and the government did not immediately respond to requests for comment.