Federal immigration authorities arrested 44 people Friday across Los Angeles, prompting clashes outside at least one location as law enforcement threw flash bangs to try to disperse a crowd that had gathered to protest the detentions.

Approximately 44 people” were administratively arrested ​​and one person was arrested on an obstruction charge, Homeland Security Investigations said.

The FBI confirmed it’s participating in the HSI raids, not just in Los Angeles but nationwide, “as directed by the Attorney General.”