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.

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.

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.