CHP Officer Sam Morgan said investigators went to eastbound Highway 580 at Harrison Street at about 5:45 p.m. on reports of the shooting and found an abandoned 1998 Chevrolet Camaro that had been shot multiple times.
A short time later an El Sobrante man who had suffered a gunshot wound showed up at Summit Medical Center. The man was then transported to Highland Hospital for treatment for the injury, which didn't appear to be life-threatening, Morgan said.
He said investigators determined the man was in the front passenger seat of the Camaro when he was shot. Officers are working to determine the whereabouts of the vehicle's driver, according to Morgan, who said it was not immediately clear whether the driver was injured in the shooting. The vehicle is registered out of Citrus Heights.
Morgan said preliminary reports indicate the shots were fired from another vehicle on the highway, but that the CHP does not have any definitive information on the suspect vehicle.
"We did find expended casings on the highway," Morgan said, adding that investigators are trying to determine what type of gun was used.
The shooting prompted the closure of the No. 1 lane of eastbound Highway 580 for about two and half hours tonight, and a brief closure of all eastbound lanes, CHP Officer Robert Haven said. All lanes of the highway were open by about 8:15 p.m.