An investigation is underway after a man was shot while inside of an Alaska State Troopers patrol unit. 

The incident began after troopers received word of a suspicious person Saturday on the Sterling Highway near  Echo Lake Road around 2:45 p.m. A trooper responded and located the subject and offered him a ride home due to the below-freezing temperatures. 

Troopers say the man produced a handgun while in the back of the patrol unit. The trooper was able to safely exit the vehicle and call in backup. 

Troopers attempted to negotiate with the man, but they say he refused to cooperate and eventually pointed his gun at the troopers and was fired upon by AST. 

The man, who has not yet been identified, was taken to Central Peninsula Hospital for treatment.

AST identified the trooper who pulled the trigger as Lieutenant Dane Gilmore, deputy commander of E Detachment, who is a 24-year DPS veteran. 

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