Tualatin Valley Fire & Rescue personnel said the truck was reported Sunday morning in a tree off Highway 99W near Sherwood, KPTV, Portland, Ore., reported Monday.
Investigators said there were no occupants at the scene and no one suspected to have been involved in the crash turned up at Providence Newberg hospital.
Sensors did not pick up any heat signatures, indicating the truck had been unoccupied in the tree for some time.
The incident is being investigated.
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