UPDATE 5:01 p.m. EST:
CNN reports that 14 people have been arrested afer pro- and anti-Trump groups clashed.
ORIGINAL STORY: At least four people have been arrested after violence erupted on Saturday between pro and anti-Trump groups, who were holding rallies in downtown Berkeley, the Associated Press reported. About 200 people were at Berkeley's Martin Luther King, Jr. Civic Center Park when several people became rowdy and started pushing one another.
Dozens of police officers stood nearby, eventually arresting one man. More followed after fistfights broke out.
"Feels like a war zone at this Berkeley alt-right rally."
This isn't the first time violence erupted in Berkeley. Ahead of an appearance by right-wing commentator Milo Yiannopoulos, protesters caused $100,000 worth of damage to the campus. The university ultimately blamed "150 masked agitators" for the unrest, saying they had visited the campus to disturb an otherwise peaceful protest, CNN reported.