LAKEWOOD, Wash. (AP) — A hit-and-run crash on Interstate 5 in Lakewood killed three people and closed most of the highway into the morning commute.

The Washington State Patrol says a 23-year-old man was swerving across the southbound lanes when he struck a car at about 2:15 a.m. Thursday. That vehicle rolled over, killing three people inside, and its engine block launched into the northbound lanes, prompting another crash. No one was hurt in that crash.

The driver kept going but was subsequently arrested for investigation of vehicular homicide. Investigators say an off-duty Seattle Police Department dispatcher saw the crash and gave detailed information about where the driver fled, and when they found the car a woman was outside it trying to rip off its bumper.

Troopers say the driver had no driver's license and is suspected of being under the influence. A stolen firearm was also found in the vehicle.

The crash and investigation closed all southbound lanes and three northbound lanes for about five hours. A DuPont officer who responded suffered minor injuries when his or her patrol car was struck by a semi at the scene.