BERKELEY, Calif. (AP) — The Berkeley Police Department says it has arrested 17 people and confiscated weapons from a confrontation between alt-right protesters and counter-demonstrators in the city's downtown.

The department issued a tweet announcing the arrests and said "if necessary, we will continue to make more. We're also continuing to confiscate weapons."

The San Francisco Chronicle reports that groups of protesters surged along Berkeley's central streets and squared off in Civic Center Park, where a small group of "anti-Marxists" sparred with those who came out to denounce them as white supremacists.

The newspaper says the confrontations ended by the evening.

The Chronicle says Berkeley police had prepared for possible violence by setting up barriers in Civic Center Park and by closing surrounding streets to vehicle traffic.