An Antifa protest in Berkeley turned violent Sunday when one masked group member sucker-punched a detractor and other agitators smashed the windows at a Marine Corps recruiting post, cellphone video showed.

Authorities arrested 20 people during the dueling California demonstrations between Antifa and individuals affiliated with the so-called “alt-right.” Three people suffered minor injuries after a group of “extremists” threw “explosives” — believed to be fireworks and flares — at police and the Alameda County Sheriff’s officers. No members of law enforcement were hurt.

In a series of photos posted to Twitter by filmmaker Ford Fischer, members of Antifa can be seen smashing the windows of the U.S. Marines Corps recruiting office on Shattuck Avenue. Source