White Americans are the biggest terror threat in the US, killing more people in attacks than Muslims or any other group in the last 14 years, according to a study done by the New America Foundation.

The group looked into the 26 attacks on US soil that it defined as terror and found that 19 of those attacks were done by non-Muslims. All the studied attacks are post-9/11.

Since then, 48 people have been killed by extremists who are not Muslim, compared to 26 killed by people who claimed to be jihadist. The non-Muslim groups include right-wing, anti-government organizations and white-supremacist groups.

Last week’s Charleston shooting — after which reports surfaced of the confessed shooter’s white-supremacist ideology — was included in the count.

Other attacks, like the massacres in Aurora, Colorado and Newtown, Connecticut, were not included, since they do not appear to have been caused by a specific ideology, the standard used by New America Foundation to qualify terrorism.

This information may shock the public, as post-9/11 trauma has made jihadi terror attacks more prominent in the media, but US law enforcement is well aware of the danger of white extremist groups, the New York Times reported.

A recent survey done by researchers at the University of North Carolina and Duke University asked 382 US police departments to list top threats and 74 per cent listed anti-government violence, while just 39 per cent said “Al Qaeda-inspired” violence.

“Law enforcement agencies around the country have told us the threat from Muslim extremists is not as great as the threat from right-wing extremists,” Charles Kurzman, a UNC researcher, told the Times.