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.

Officers lined up on a downtown street with batons and tear gas rifles, confronting demonstrators after being ordered to disperse the crowds.

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