Man missing in Yellowstone National Park

Laramie, WY – Yellowstone National Park official say a search is underway for an Oklahoma man missing since Monday.
On Monday morning, park rangers found a car with Oklahoma license plates parked at a trailhead. The vehicle, which had obviously been parked overnight, was not associated with an overnight backcountry permit.
A preliminary search and questioning of hikers, backpackers, and area businesses have failed to turn up any information on the man's whereabouts. Dog teams are also searching.
Peter Kastner is described as 25 years old, 6 foot 1; 185 pounds, with brown hair and hazel eyes.
Rangers believe Kastner may have been in the area for up to two weeks, and may not have been using his own name in any contact with individuals or businesses.