Berkeley police released video Thursday of roving bands of black-clad vandals who smashed the windshields of 21 city vehicles, setting one blaze, during a violent weekend clash between anti-fascist and anti-Marxist protesters.

At least 20 people were arrested, many armed with a variety of weapons, at Sunday’s “No to Marxism in America 2” rally. During the height of the violent confrontation, a group of masked persons dressed in black clothing used hammers to vandalize 21 City of Berkeley vehicles parked in an off-street parking lot.

One of the vehicles was set on fire.

In a separate act of vandalism, at least two black-clad protesters can be seen smashing the windows of the Marine Corps Recruiting Center with hammers. The suspects repeatedly hit the windows with a hammer or tire iron causing an estimated $2,000 worth of damage. An ATM machine was also vandalized.