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STANWOOD, Wash. -- Authorities say the gun used in the fatal shooting of a 7-year-old police officer's daughter belonged to that officer and was not issued by his department.

Jenna Carlile was inside her family's van March 10 when one of her younger siblings found the loaded handgun and fired it. The girl was struck and died at a Seattle hospital.

The Snohomish County Sheriff's Office said Tuesday that four children, all under the age of 7, were alone in the van at the time of the shooting. The parents were out of the vehicle at the time, but nearby. The agency isn't releasing the name of the child who fired the gun.

Marysville police earlier identified the officer as Derek Carlile, of Camano Island.

Once they complete their investigation, detectives will forward their case to prosecutors.

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