Violent protests erupt at Trump rally in Calif.

About 20 people were arrested after violent protests erupted outside of a Donald Trump rally Thursday night in Costa Mesa, Calif.

{mosads}The Orange County Sheriff’s office tweeted that about 20 were arrested during the demonstrations, but it reported no serious injuries.

Police had positioned themselves between Trump supporters and protesters of the event, and the crowd swarmed not long after it was ordered to disperse.

Footage of the conflict shows one protester jumping up and down on top of a smashed police car.

The police car, from a few minutes ago pic.twitter.com/o2ChcXadT3

— Jim Dalrymple II (@JimDalrympleII) April 29, 2016

There were also scuffles that broke out between the supporters and protesters. Images circulated on social media of a man wearing a Trump shirt with a bloody face who was reportedly punched by a protester.

A @realDonaldTrump supporter just got punched in the face as a scuffle broke out in the street: pic.twitter.com/3h3Fllm3V3

— Jeremy Diamond (@JDiamond1) April 29, 2016

According to reports, many of the demonstrators were Hispanic and were protesting the Republican front-runner’s immigration proposals. Trump has vowed to deport 11 million undocumented immigrants and to build a wall along the border with Mexico.

Trump’s campaign events have been repeatedly marred by violence, and he has faced calls to condemn the unrest more strongly.

Some people just smashed cop car back window. Witnesses said 5 mins ago. Police in tactical gear now moving in pic.twitter.com/Xoihj5Z7eK

— Jeremy Diamond (@JDiamond1) April 29, 2016

Just witnessed 3 arrests as police ask pedestrians to disperse & move out road: pic.twitter.com/wCuqFgrdxh

— Jeremy Diamond (@JDiamond1) April 29, 2016