Elected officials must stop using “broad brushes” to define members of a race or religious community, according to the chief of the Austin Police Department, who said doing so only makes people more likely to become radicalized lone wolves.

Chief Art Acevado testified Wednesday before the House Homeland Security Committee about how to stop lone-wolf attacks in the U.S., something he called an “imminent threat” that keeps him up at night. One of the key things is to “build bridges” and make people feel welcome instead of referring to large groups of people as criminals.