Lt. Gregg Hastings says the truck driver, 63-year-old Charles VanZante of Jerome, Idaho, was flown to a Boise, Idaho, hospital where he was being treated for injuries that were not considered life-threatening.
Police say the attacker first used his car to ram the truck's diesel tanks as the vehicles drove along Interstate 84 west of Ontario, Oregon. After the truck stopped, the attacker entered the truck and started stabbing the driver.
Troopers arrested a man for investigation of attempted murder and assault. They say they haven't yet positively identified him.