Hawaii County police are investigating an apparent stabbing aboard a Hele-On bus in Honokaa that left a 40-year-old man with a serious head wound.

According to police, the victim and the suspect had been arguing when the suspect cut the victim’s forehead with an unknown instrument. The suspect then exited the bus and ran away.

A suspect was identified but has not yet been arrested.

Police are investigating the incident as a first-degree assault.

Police ask that anyone who may have witnessed the incident call the Police Department’s nonemergency line at 935-3311 or contact officer Paul Isotani at 775-7533. Tipsters who prefer to remain anonymous may call CrimeStoppers at 961-8300.