National Park Service employee in critical condition after assault in Ariz.

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WILLCOX, Ariz. -- The Cochise County Sheriff's Office is investigating an apparent assault on a 59-year-old National Park Service employee that left her in critical condition.

Sheriff's office spokeswoman Carol Capas said the woman was found unconscious Wednesday afternoon in a picnic area restroom in the Chiricahua Mountains south of Willcox. She appeared to have head trauma.

The worker was airlifted to a Tucson hospital where she remains in critical but stable condition. Her name has not been released.

Capas said the woman's government vehicle was missing. Authorities tracked her cellphone, which was inside the vehicle at the time it was stolen, and located the silver Dodge Dakota in Douglas at approximately 7 p.m.

The vehicle is being processed for evidence by the sheriff's office with the assistance of the FBI.

"We have all available resources dedicated to this case and we are working closely with our local, state, and federal partners to identify the suspect(s) who apparently seriously injured a federal employee, before stealing her vehicle and fleeing the area," Cochise County Sheriff Mark Dannels said.

Anyone with information regarding this incident is asked to contact the Cochise County Sheriff's Office at 520-432-9500.