Washing slaying suspect believed to be hiding in fortified bunker April 28, 2012 -- Updated 0135 GMT (0935 HKT) Police say a murder suspect is hiding in a fortified bunker The structure was built in a hillside east of Seattle, Washington Peter Keller is suspected of killing his wife and daughter (CNN) -- A Washington state man wanted in the weekend killings of his wife and daughter was believed to be holed up Friday evening in a fortified bunker about 25 miles east of Seattle, authorities said. The homemade bunker is located outside of North Bend, according to the King County Sheriff's Office. SWAT teams swarmed the scene and tear gas was dropped into the hillside structure in an effort to smoke out suspect Peter A. Keller. Keller is described by authorities as an avid hiker. This isn't a hole in the ground. This is a large built-up structure," said Sheriff Steven D. Strachan. But hidden. It took some time to find it. In fact our tactical team smelled the wood smoke coming before they actually saw it. Clues to Keller's whereabouts came during the processing of the crime scene at his house, authorities said. Citizens also reported seeing Keller's pickup truck near a trailhead. Strachan said the house was set afire Sunday after the slayings, but it failed to spread beyond the kitchen. Authorities found a hard drive with photos, he told CNN Seattle affiliate KING. One photo was enhanced and it aided in the search for Keller, who authorities said had been building the bunker for at least eight years. The sheriff's office earlier this week sought an arrest warrant for Keller, stipulating two counts of first-degree murder and first-degree arson. The bunker was found early Friday about 800 yards off the trail, built partially underground. It featured ladders and multiple entrances, according to KING. KING identified the shooting victims as Keller's wife, Lynette, and 18-year-old daughter, Kaylene.