Some law enforcement members participated in arson and murders that occurred during the 1921 race massacre in Tulsa, Oklahoma, according to a U.S. Department of Justice report released Friday.

The Justice Department’s conclusion follows an investigation of the 1921 atrocity in Oklahoma in which up to 300 Black residents were killed.

The first-ever U.S. Justice Department review of the 1921 Tulsa Race Massacre finds there is no longer an avenue to bring a criminal case in association with the attack by a white mob on a thriving Black district.