CAMP VERDE, Arizona–Authorities in Yavapai County say a plane crash late Saturday afternoon claimed the life of two Arizona residents after the plane reportedly failed to return on time.

The two plane occupants have been identified as pilot Glenn Tenniswood, 68, of Camp Verde, and passenger Ron Walker, 78, of Camp Verde.

Yavapai County Sheriff’s Office spokesman Dwight Develyn said around 6:30 p.m. Saturday the YCSO received a call concerning an overdue small plane and that a family member of the plane’s owner had been attempting to reach the pilot for several hours, without success.

Develyn said the pilot had indicated to family members he was taking a friend for a short flight around Yavapai County.

Further investigation reportedly showed local aircraft towers having no record of the plane in the air. Deputies that obtained GPS coordinates from a cell phone belonging to one of the plane occupants. An Arizona Department of Public Safety Ranger crew were dispatched and located the plane around 8:30 p.m. in a remote and very rugged terrain just southeast of Montezuma Castle in the Camp Verde area.

The plane was reportedly a home built type aircraft. An official from the National Transportation Safety Board is currently investigating the cause of the crash.

No additional details are available at this time.