The authorities have released the names of a Korean couple who were among nine people killed in a bus crash on Interstate 84 in Eastern Oregon.    

Oregon State Police Lt. Gregg Hastings identified the pair Wednesday as 67-year-old Oun Hong Jung and his 63-year-old wife, Joong Wha Kim. The couple had been staying with relatives in Bothell, Wash.    

A 57-year-old Spanaway man, Dale Osborn, was also killed in the crash.

The crash occurred as the bus was returning to Vancouver, British Columbia, on the final leg of a nine-day tour of the western United States. The trip was organized by a British Columbia travel agency. Most of the passengers were Korean.    

The cause of the crash has yet to be released.     

State transportation officials say the crash was Oregon's deadliest since October 1971.