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.

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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
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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

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
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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
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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
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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
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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
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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
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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
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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
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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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