This event is still in progress as of the time of this writing and is being updated.
The "No Marxism In America" event was officially canceled prior to the scheduled time on Sunday due to safety concerns.
An estimated 4,000 people are present, mostly antifa, and seven people have been arrested so far. They are chanting "No Trump, no wall, no USA at all."
In addition to attacking right-wing supporters, the group also attacked journalists as they tried to stop people from filming the violence. KTVU Fox32 reporter Leigh Martinez and her photographer were attacked while filming marching.
Law enforcement worked to keep the groups separate, but they started to intermingle and fight broke out.
At one point the Antifa used their shields disguised as signs to form a line against police.
Police had to use gas to disperse a crowd of antifa who had surrounded a patrol car.
The antifa are mobbing people and calling them Nazis. It's not clear if any white supremacists or neo-nazis are present. They appear to be focusing on chasing down people who wear any pro-Trump hats or clothing.
This is a developing story and we will keep you updated. For all of our updates, follow us on Facebook and go to your news feed preferences under your settings, then select that you want to see more of Blue Lives Matter posts in your news feed. Otherwise, Facebook may not show you updates.