SANTA ROSA (CBS SF) — Police are investigating a Tuesday stabbing that occurred at a shopping center parking lot across from the Santa Rosa Junior College campus in Santa Rosa.

Officers responded at 4:04 p.m. to a report of an assault that occurred in the 1800 block of Mendocino Avenue.

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Responding officers located a man on the ground in front of a store suffering from stab wound, police said.

The victim, identified as an 18-year-old man, was exiting a parked vehicle when his door accidentally struck the side of the vehicle parked next to his, police said.

The occupants inside the parked vehicle, described as two men in their 20s, exited the vehicle, confronted the victim and started to shout and flash gang hand signs, police said.

The suspects punched the victim several times, and one of the suspects pulled a stabbing instrument and stabbed the victim once in the abdomen, police said.

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The suspects then fled the area in their vehicle.

The victim was transported to the hospital with injuries that were critical but not life threatening.

Police said the victim does not have any known gang association. His identity has not been released.

Anyone with information on the incident is asked to call the Santa Rosa Police Department at (707) 543-3670.

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A $2,500 reward is being offered for information leading to the arrest and conviction of the suspects involved in the assault.