The first-ever U.S. Justice Department review of the 1921 Tulsa Race Massacre concluded Friday that while federal prosecution may have been possible a century ago there is no longer an avenue to bring a criminal case more than 100 years after one of the worst racial attacks in U.

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.