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The Orange County Register via AP) MAGS OUT; LOS ANGELES TIMES OUT; MANDATORY CREDIT, Michael Goulding
Protesters face-off outside a Donald Trump rally at the Anaheim Convention Center on Wednesday, May 25, 2016 in Anaheim, Calif. A small but vocal group of people protested outside a Donald Trump campaign rally Wednesday in Orange County amid a heavy police presence to guard against a repeat of raucous demonstrations at other Trump events.

ANAHEIM, Calif. — At least five people were detained Wednesday as police descended on protesters outside a Donald Trump rally in California.

The arrests came after police declared an unlawful assembly in an announcement from a helicopter and protesters thinned out.

Shouting matches had erupted between opponents and a few supporters of the presumptive Republican presidential nominee outside Anaheim Convention Center.

Earlier, demonstrators pummeled a Trump pinata, decapitating it outside the center, where lines of law enforcement officers guarded entrances to Trump's speech.

Some demonstrators with their faces covered by bandannas shouted expletives against the candidate, while others stood quietly with signs reading "migration is beautiful" and "we are not rapists."

Lizbeth Barrera of Anaheim is only 17 and can't vote this election. But the high school junior said she came out to protest against Trump because of his comments about Mexicans, among other reasons.

"We don't need a racist coming here and trying to convince people to vote for him," she said while holding a sign calling Trump a misogynist and bully.

Wearing a red "Make America Great Again" cap, Andrew Willingham, 24, said he has long disdained voting, and at first was wary of Trump, but was drawn in by his support for free markets.

"He's anti a lot of regulation, pro wall, which mean less minimum wages," he said. "I watched more and more of his stuff, and yeah, I fell in love."

Last month, anti-Trump demonstrators took to the streets outside a similar event in nearby Costa Mesa, damaging police cars and throwing bottles. At least 17 people were arrested.

Trump has drawn thousands of ardent supporters to his events along with passionate critics of his plans to build a wall on the Mexican border and his comments about immigrants and Muslims.

His appearances have generated protests in other states as well, most recently Tuesday night in Albuquerque, N.M., when demonstrators outside a rally clashed with police. Officials said several officers were injured by rocks and at least one person was arrested.

A message was sent to the Trump campaign seeking comment.