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Image: A demonstrator climbs a traffic light outside Republican U.S. presidential candidate Donald Trump's campaign rally in Costa Mesa

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Trump Protesters Clash With Police Outside Trump Rally

Police moved in to control the crowd as protests turned violent outside a Trump event in California.

/ 14 PHOTOS
Image: Police on horseback and in riot gear pass by a damaged police car as they break up a demonstration outside Republican U.S. presidential candidate Donald Trump's campaign rally in Costa Mesa

Police on horseback and in riot gear pass a damaged police car as they break up a demonstration outside Republican presidential candidate Donald Trump's campaign rally in Costa Mesa, California, on April 28, 2016.

Police arrested 20 people outside a Donald Trump rally in California Thursday night amid the worst violence since last month's cancelation of a campaign event in Chicago.

— MIKE BLAKE / Reuters
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Some anti-Trump demonstrators are arrested after the rally at the Pacific Amphitheatre. Hundreds of people, most of them apparently anti-Trump protesters, blocked an intersection and some jumped on cars outside the Orange County Fairgrounds, where Trump gave a speech to thousands Thursday night.

— Michael Goulding / The Orange County Register via AP
Image: A demonstrator climbs a traffic light outside Republican U.S. presidential candidate Donald Trump's campaign rally in Costa Mesa

A demonstrator climbs a traffic light outside the rally.

There were no major injuries, the Orange County Sheriff's Department said, adding that the crowd had dispersed by 11 p.m. local time (2 a.m. ET).

— MIKE BLAKE / Reuters
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A Trump supporter clashes with protesters outside the rally.

— Chris Carlson / AP
Image: Demonstrators sit in front of a line of police in riot gear outside Republican U.S. presidential candidate Donald Trump's campaign rally in Costa Mesa, California

Demonstrators sit in front of a line of police in riot gear outside the rally.

Protests at Trump rallies have occasionally ended in clashes. In March, a planned Trump rally in Chicago descended into chaos, with fistfights breaking out between supporters and opponents of the controversial candidate.

— MIKE BLAKE / Reuters
Image: Police in riot gear arrive to break-up a demonstration outside of Republican U.S. presidential candidate Donald Trump's campaign rally in Costa Mesa, California

Police in riot gear arrive to break-up a demonstration outside the rally.

— MIKE BLAKE / Reuters
Image: Police in riot gear form a line to begin to break up a group of protesters outside Republican U.S. presidential candidate Donald Trump campaign rally in Costa Mesa

A protester waves a Mexican flag in front of police in riot gear.

— MIKE BLAKE / Reuters
Image: Police in riot gear arrive to break-up a demonstration outside Republican U.S. presidential candidate Donald Trump's campaign rally in Costa Mesa

Police in riot gear arrive to break up the demonstration.

— MIKE BLAKE / Reuters
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Protestors are pushed off the street by law enforcement after the rally.

— Chris Carlson / AP
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Donald Trump greets supporters after the rally.

— Chris Carlson / AP
Image: Republican U.S. presidential candidate Donald Trump arrives to speak at a campaign rally in Costa Mesa, California

Donald Trump arrives to speak at the rally.

— MIKE BLAKE / Reuters
Image: Protest against US presidential candidate Donald Trump in Costa Mesa, California

Protesters are separated from Trump supporters by a line of riot police officers outside the rally. Trump has begun campaigning in California ahead of the June 7 primary.

— EUGENE GARCIA / EPA
Image: Supporters of Republican U.S. presidential candidate Donald Trump cheer at a campaign rally in Costa Mesa, California

Trump supporters cheer at the rally.

— MIKE BLAKE / Reuters
Image: Elaine Theiss waits to hear Republican U.S. presidential candidate Donald Trump speak at a campaign rally in Costa Mesa, California

Elaine Theiss waits to hear Donald Trump speak at a campaign rally in Costa Mesa, California, on April 28.

— LUCY NICHOLSON / Reuters
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