According to the FBI's annual risk assessment, white supremacists pose the greatest threat of committing "lethal violence against civilians" in the United States.
According to the bureau, radicals "driven by a belief in the superiority of the white race continue to pose the primary threat among domestic violent extremists of committing lethal violence against civilians."
In the last five years, white supremacists have carried out at least 17 attacks, killing 77 people and accounting for more than half of all domestic terrorism deaths.
The most recent attack by a white supremacist was in May of this year, when a man killed 10 people at a supermarket in Buffalo, New York. The man pleaded guilty to murder and other charges.
Extremists acting as part of a transnational movement are using online networks to claim the mantle of a "leaderless resistance" to multiculturalism, according to the FBI. TheAdherents believe that white people of European descent are superior to and threatened by minority populations, as well as by other whites whom they perceive as supporting these populations.
The FBI assessment came just days after former President Donald Trump met with a white supremacist, sparking criticism from Democrats and some Republicans.
According to the FBI report, followers of the Black Hebrew Israelite ideology have carried out deadly attacks against Jews and law enforcement in the past.
According to the report, left-wing violence poses a smaller threat and is likely to consist of criminal activity.
Anarchist violent extremists, as the FBI calls them, will likely "plot and potentially conduct sporadic attacks" on critical infrastructure and government buildings, as well as engage in "violent physical assaults against their perceived opponents." The report states that radicals will most likely remain focused on people or institutions that represent authority, capitalism, and oppression.
Tell us about a news story. C Davis is the reporter for Insider.