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Napa Police are describing a reported assault Saturday off Highway 29, which resulted in a driver being sent to the hospital, as a road rage incident and are seeking witnesses to the attack.

The incident began around 2 p.m. on southbound Highway 29 near First Street and involved the drivers of a burnt-orange Harley-Davidson motorcycle and a blue Honda CR-V sport-utility vehicle, according to Sgt. Todd Shulman.

After the motorists left the freeway at the Imola Avenue exit and stopped at a traffic signal, the Harley rider got off the motorbike and assaulted the Honda driver, a 79-year-old man, before getting back on the bike and speeding off, Shulman said.

The victim, whom police did not immediately identify, was taken by ambulance to Queen of the Valley Medical Center with serious injuries and was later released, according to Shulman. Police gave no details on the attack but said no firearms were used.

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Napa Police describe the suspect as a white male possibly in his mid-30s, with brown hair and a stocky build, wearing a black T-shirt and black baseball cap.

Anyone who witnessed the incident or who can identify the motorcyclist is asked to call police at 707-257-9223, or send an anonymous tip on a smartphone by texting 707NPD followed by the tip information to 847411 (Tip411).