Dueling pro- and anti-Trump rallies in Berkeley, Calif., turned violent Saturday as numerous fistfights broke out and protesters fired pepper spray into a crowd. Police arrested more than a dozen people and requested aid from other law enforcement agencies.

It was not immediately clear what protesters were charged with, or whether there would be more arrests. The Berkeley Police Department seized numerous prohibited items, including sticks and knives, according to the agency.

In anticipation of the protests at Civic Center Park in downtown Berkeley, the agency had banned items that could be used as weapons, such as pepper spray, mace, baseball bats and glass bottles.

Hundreds of people gathered at the park for a pro-Trump rally and a counterprotest, some dressed in black and wearing masks, the Los Angeles Times reported. There were loud explosions and fistfights among members of both groups, and a citizen militia group wearing security gear showed up to protect the pro-Trump demonstrators. Berkeley police officers, wearing riot helmets, separated pro- and anti-Trump attendees, the Times reported.

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