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 Department of Justice found in a newly released report that though the Tulsa Race Massacre was a “systematic” and “coordinated” attack that transcended mere mob violence, any legal repercussions are no longer possible in light of the statute of limitations.

A new federal review finds the 1921 Tulsa Race Massacre was the result of systematic, racially motivated violence targeting Black residents of the city’s Greenwood District.