SAN FRANCISCO (KCBS) — A man was arrested on suspicion of DUI after pinning a man under his car at a gas station in San Francisco’s Richmond District early this morning, according to police.

Officers responded to a report of the incident at a Chevron gas station on 24th Avenue and Geary Boulevard around 3:30 a.m., Sgt. Chris Breen said.

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Upon their arrival, police found the man with his head wedged underneath the rear tire of a green Acura in the driveway of the gas station suffering major trauma.

Before the incident there was some sort of exchange between the driver and victim, Breen said.

The victim, a 50-year-old white male, was transported to San Francisco General Hospital for his injuries. He is in critical condition but is expected to live, Breen said.

Breen said that two people in the Acura arrived at the gas station with a flat front-left tire.

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“They had a blowout in some other place and they came here to change the tire,” Breen said.

Breen said it wasn’t yet clear how the man ended up on the ground or when he was rolled over.

“They were changing a tire. In terms of how the impact occurred, it’s still under investigation but there is no question that at some point his head was underneath the tire,” Breen said.

“The fire department arrived on the scene and they were able to hoist up the rear end of the vehicle, thereby freeing the victim’s head.”

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The driver of the vehicle, who was confrontational when investigators first arrived and the passenger was being questioned as a witness, Breen said.