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WILLIAMS, Ariz. (AP) — Authorities say the wreckage of a small plane has been found in northern Arizona and its two occupants are dead.

Coconino County Sheriff’s officials say deputies received a report Sunday night of an overdue aircraft from Vista, California.  The plane, carrying 37-year-old Timothy Gill and Joylani Kamalu, 38, was slated to land at Grand Canyon National Park Airport and had an appointment in the Tusayan area scheduled for Monday morning, said Jon Paxton, spokesman for the Coconino County Sheriff’s Office.

A helicopter crew with the Arizona Department of Public Safety Air Rescue located the crash site northeast of H.A. Clark Memorial Field in Williams, Arizona, shortly after 1:30 a.m., Paxton said.

Investigators with the Federal Aviation Administration and National Transportation Safety Board were called in to try to determine the cause of the crash.