The number of mass murders connected to extremism in the US has increased dramatically over the past ten years, according to a report issued on Thursday.

The Anti-Defamation League concluded that the number of extremist mass killings in the recent decade was at least three times more than in any other 10-year period since the 1970s. The paper analyzed mass killings committed by individuals with ties to extremist movements or ideologies; from the 1970s through the 2000s, between two and seven such massacres happened annually in the United States. In the 2010s, the number increased to twenty-one. In addition, the researchers concluded that every extremist killing in 2022 was connected to right-wing extremism, specifically white supremacy. The report stated, “It is not an exaggeration to argue that we live in an age of radical mass murders.”