LOS ANGELES (AP) — After federal immigration authorities arrested more than 40 people Friday across Los Angeles, protesters gathered outside a federal detention center demanding their release before police in riot gear tossed tear gas canisters to disperse the crowd.

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

Helmeted police in riot gear turned out on Friday evening in a tense confrontation with protesters in downtown Los Angeles, after a day of federal immigration raids in which dozens of people across the city were reported to be taken into custody.