MOSCOW, Idaho (AP)-Idaho police say they found five guns and a laptop computer in the vehicle of a man suspected of killing three people in a shooting spree Saturday.

John Lee was arrested following a high-speed chase in nearby Washington state. Police believe he killed his landlord, his adoptive mother and a manager at a restaurant his parents frequented.

A Seattle man was also critically injured in the shootings. Moscow, Idaho, Police Chief David Duke says investigators searched the 29-year-old's car and apartment late Saturday night.

They found three handguns, a shotgun and a rifle in the vehicle, along with a laptop. Duke says police still don't know what prompted the rampage, but authorities are seeking a warrant to search the computer.

Lee was booked in Whitman County Jail in Washington. Idaho authorities will seek his return for investigation of first-degree murder and attempted murder.