Protesters surrounded a police car in Sacramento on Monday and one climbed on top of the cruiser, prompting the officer driving to speed away.
The angry mob, full of people protesting against President Donald Trump's visit to the city, banged on the vehicle as a white male stood in front of it, blocking the driver's path.
The driver piloting the California Highway Patrol vehicle suddenly sped forward, propelling the man onto the top of the car. He tried to find a grip as he moved along the top but could not, and was hurled off the back.
The man was taken to a hospital by ambulance, according to video from the scene.
A California Highway Patrol spokesman told The Epoch Times via email that two officers who had been conducting traffic control attempted to leave the area.
"As the lead vehicle began to pull away, one of the protesters climbed up the hood of the patrol vehicle. Fearing for his safety, the officer began to accelerate away and the protester fell off the vehicle," the spokesman said.
The protester was rushed to the hospital with minor injuries.
People on the ground blamed the police.
There was no evidence that Trump supporters were driving any of the vehicles.
A patrol spokesman told the Bee that the driver of a green Volvo that allegedly struck several people was questioned but not arrested.
Video footage showed the vehicle driving past a crowd of anti-Trump protesters who were blocking a lane of traffic when it came to a stop to avoid hitting a person. Some of the group began striking the car. The driver then sped forward, swerving at part of the group, who jumped out of the way.
Several people were struck, according to people on the ground.
Trump met with California Gov. Gavin Newsom and other state officials in Sacramento on Monday before bestowing medals on California National Guard members who made heroic rescues amid a raging wildfire earlier this month.