A man pleaded not guilty Monday to allegedly inciting protesters to riot at a Donald Trump rally in Costa Mesa and throwing an object that damaged a patrol vehicle, according to the Associated Press.

Luis Fernando Alarcon, 19, of Anaheim is being charged with a felony count of vandalism over $400 and a misdemeanor charge of inciting a riot, according to a press release from the Orange County District Attorney's Office.

According to the release, a crowd of Trump protesters blocked the street on April 28 as the group moved south toward State Route 55. Alarcon allegedly ran toward a California Highway Patrol car, yelled "F--- the police!" at an officer through a patrol car window, yelled again and then hurled an object at the car. The officer said that they heard a thud and then saw what looked like a rock or a roof tile fall to the ground.

Alarcon allegedly went back into the crowd and continued to protest and obstruct traffic, but wasn't arrested at the time as the CHP dealt with closing a ramp. Alarcon was allegedly in front of the crowd, yelling toward the officers and inciting the crowd while rocks were thrown at officers from the crowd.

Alarcon faces up to three years in Orange County jail. He's being held on $25,000 bail.

Alarcon is scheduled for a pre-trial hearing on May 9.

Costa Mesa police made other arrests, but they haven't been submitted yet to the D.A.'s office, according to the release.

This story has been updated.