SONORA (CBS13) — The search is on for a man in connection to an unprovoked attack involving a crowbar over the weekend in Sonora.

The incident happened Saturday evening along the 400 block of Stockton Road. Sonora police say a man was driving down that stretch of road when another driver, 41-year-old Wesley R. Dunn, drove past him. For some reason, Dunn allegedly honked his horn, made a U-turn, then got out and attacked the other driver with a crowbar and left.

READ MORE: Placer County Sheriff's Deputy Finds Heroin During Traffic Stop In Penryn

ALSO READ: Driver Arrested After Crashing Into CHP Patrol Car In Sacramento, Running Away

READ MORE: Orangevale Music Venue The Boardwalk Shutting Down

It’s unclear what provoked the attack, police say. The victim told police he and Dunn knew each other and have had prior issues, though.

The other driver wasn’t seriously hurt in the attack, police say.

MORE NEWS: Record Number Of Loaded Guns Found At US Airport Security Checkpoints

Anyone who sees Dunn or knows where he might be is asked to call Sonora police.