SACRAMENTO (CNN) -- Caught on camera -- a driver repeatedly hitting another car with his SUV.
A witness recorded as he turned a city street into a demolition derby for more than 10 minutes.
It started with a crash loud enough for Nikki Guinn to run outside her home near X Street in Sacramento.
"I was inside my house and I heard a car accident," Guinn said. "So I grabbed my phone and ran outside with it."
Her cell phone camera captured 12 minutes of chaos.
"It's not something you see every day," said Guinn.
Watch as the white SUV plows into the blue car.
When the car can't move anymore, a man gets out and you see him stomping and kicking the blue SUV.
An ambulance shows up, then a Sacramento patrol car moves in.
"I think our officers acted heroically in this. They were very patient," said Sgt. Vance Chandler with the Sacramento Police Department.
Officers kept their distance at first.
Sergeant Chandler says this started as a road rage incident on Cap City Freeway near 5th Street.
"A caller called us advising that there was another driver behind them and they had been rammed by that driver," he said.
Police say after the driver rammed a moving car, he focused on the blue car.
At one point, he falls off.
That's when officers move in and detain him.
"My thought was I witnessed somebody's mental breakdown essentially," Guinn said.
Guinn still wonders, why did this happen?
"What was he going through? Why would he do that? We don't know."
Police say the driver was under the influence of narcotics and sent him to the hospital for evaluation.
When he is released, he will be booked on felony assault and vandalism charges.
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