A house fire at the Quinault National Fish Hatchery on the Olympic Peninsula is believed to have killed a young married couple. Lloyd and Rhonda Smith were presumed dead after the fire destroyed their home early Sunday. Lloyd Smith Jr., 34, was a member of the Quinault Tribe. Rhonda, 32, was a member of the Port Gamble S'Klallam Tribe. The fire was reported early the morning of May 21 by a hatchery worker who awoke to find the nearby residence engulfed in flames. Tribal firefighters were unable to extinguish the blaze. The tribal coroner hadn't formally identified the bodies May 23, said a spokesman for the U.S. Fish & Wildlife Service, which owns and operates the hatchery. The couple had spent the previous evening at a wedding reception, and their three young children - James ,10, Reuben, 9, and Miranda, 3 - were staying with relatives, the children's grandfather said. The 35-year-old salmon hatchery is about 35 miles north of Aberdeen. The cause of the fire was being investigated by the FBI, with the help of tribal police. The home on the Quinault Reservation, was equipped with two alarms that were inspected last December.