Dueling protests in Berkeley, California, that erupted into violence on Sunday have caused an estimated $2,000 in damages to the Marine recruiting station there, according to the Berkeley Police Department.

The windows of the downtown Berkeley Shattuck Ave. Marine station were targeted allegedly by counter-protest movement called Antifa, short for “anti-fascists.” The group is known to use violence to confront “alt-right” groups.

“At 1:45 pm [Sunday], the windows of the Marine Corps Recruiting Center (64 Shattuck Square) were vandalized,” Officer Byron White, a spokesman for the Berkeley Police Department, told Marine Corps Times. “From videos seen on social media, the suspects appeared to have repeatedly hit the windows with a hammer or tire iron — causing an estimated $2000 worth of damage.”

No Marines were present at the station during the incident and the recruiting station is continuing to conduct business as normal, according to Capt. Chad Hill, a spokesman for 12th Marine Corps District.

Things went awry Sunday when opposing protest movements, “No to Marxism in America 2” and Antifa, organized rallies on the same day.

Berkeley Police arrested 20 individuals, mostly for possession of banned weapons in public spaces.

About 21 city vehicles were smashed and one was set on fire, according to a Berkeley Police Department press release. There were no serious injuries reported.