San Diego police declared an assembly illegal while Trump supporters and counter-protesters clashed on Saturday, according to reports.
The protest also prompted police to warn residents to stay away from the Pacific Beach intersection “due to acts of violence”.
Local affiliate FOX 5 San Diego tweeted several photos and videos of the event, showing the two groups and the police trying to prevent the situation from getting worse.
“Stones and bottles are being thrown at the police,” tweeted the police. “Pepper spray (CO) from the crowd is being spread against the police.”
The police promised that “actions will be taken” against the police who attack.
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About 50 pro-Trump protesters and 200 counter-protesters clashed, according to KPBS. The protests started around 1 pm.
All groups appeared to be leaving the area at about 6 pm, and police said they would arrest anyone who returned or remained in the area.
At least three people were arrested for refusing to disperse, according to NBC 7 San Diego.
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In a video posted online, a group of protesters dressed in black, one displaying an “Antifascist Action” banner, can be heard shouting “racists come home” at the entrance to Crystal Pier.