The crowd gathered in the streets outside the OC Fair & Event Center as Trump addressed several thousand supporters at the Center’s amphitheater. At least one police car was damaged and several scuffles broke out amid the hectic scene.
Protesters blocked a main intersection, impeding traffic, and officers with the Orange County Sheriff’s Department and Costa Mesa Police Department worked to disperse the crowd, ordering protesters out of the streets.
About 20 people were arrested, the Orange County Sheriff’s Department tweeted late Thursday night after the protests had cleared.
Source: Protesters take to streets after Trump rally in California – CNNPolitics.com