The Anti Defamation League reports that white supremacists committed the most extremists-related killings last year by carrying out 18 of the 34 reported. Islamic groups were responsible for 9 total deaths with 8 coming as a result of the attack in New York City on Halloween. According to the same group, the number of killings committed by white supremacists more than doubled between 2016 and 2017. The total number of killings were down in 2017 from the two previous years that saw 71 in 2016 and 69 in 2015.

"These findings are a stark reminder that domestic extremism is a serious threat to our safety and security," said the group's CEO Jonathan Greenblatt. "We saw two car-ramming attacks in the U.S. last year -- one from an Islamic terrorist and another from a white supremacist in Charlottesville -- and the number of deaths attributed to white supremacists increased substantially. The bottom line is we cannot ignore one form of extremism over another. We must tackle them all."

Despite 2017 seeing an overall decrease in extremist-related killings, it still ranked as the fifth deadliest year for extremist violence.

Source: cbsnews.com