"They went down to California, they went to Disney World, they went to Las Vegas and they were having just a great time. And I don't know, this happened," said the couple's daughter Jennifer Sherman.
The Oregon State Medical Examiner's office is working with investigators, the Korean Consulate's Office and other sources to positively identify the eight other victims.
Oregon State Police said Monday all of those killed were adults, but Tuesday investigators said one of the victims could be a girl. Four males and five females were killed in the crash.
The investigation into the crash could take a month or longer. OSP will then provide their findings to the Umatilla County District Attorney's Office for review and further consideration.
OSP investigators, assisted by the National Transportation Safety Board, planned to complete an inspection of the bus Tuesday and conduct inventory for personal property and documents to aid with the investigation and identification process.
Police have started releasing some property, including passports and documents, to some of the bus passengers who were released from the hospital.
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