Domestic extremists are “are often radicalized online and look to conduct attacks with easily accessible weapons,” an unclassified version of report done by the Office of the Director of National Intelligence found. Domestic violent extremists killed 13 people in 2021, carrying out “at least” four lethal attacks, according to the bulletin by the FBI, Department of Homeland Security and the National Counter Terrorism Center — the same number as in 2020. “Domestic violent extremists represent one of the most persistent threats to the United States today,” the report says, echoing much of what the administration has been saying since President Joe Biden took office.