RAINIER, Wash. (AP) — A couple and their three-year-old granddaughter were killed in a house fire in western Washington state.

Authorities said the house in Rainier was fully engulfed in flames when they arrived early Saturday morning.

A 20-year-old woman escaped through a window but the couple, who were in their 40s, and the girl perished despite rescue efforts.

Southeast Thurston Fire Authority Chief Mark King told KIRO-TV says access to the house along a cul-de-sac with a narrow dirt road was difficult and there was no nearby water supply. The cause was under investigation.