Troopers Kristopher Sperry and Gary Miller were killed in the fire in the town of Zillah as was Miller's wife, Anne-Hewitt Miller, a spokesman for the Washington State Patrol announced.
The WSP was part of a multi-agency investigation into the fire, which also includes the Yakima County sheriff and the federal Bureau of Alcohol, Tobacco, Firearms and Explosives.
The victims lived in a relatively new three-story house that neighbors said was quickly engulfed in flames.
Witness Dolly Heyler told KIMA-TV, Yakima, Wash., that the first fire engines pulled up to the scene 10 minutes after she called 911; however, the house was well involved in flames by that time.
WSP Trooper Rich Magnusson told KIMA it would probably be later in the week before further details of the tragedy were available.