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NORTH BEND -- The King County Sheriff's Office plans to change its tactics for a dangerous standoff outside an underground bunker in the Rattlesnake Ridge wilderness area.

Saturday morning, police commanders said they would bring in a hostage negotiator to try and make contact with 41-year-old Peter Keller, who they believe is holed up inside the elaborate underground bunker.

Keller is accused of murdering his wife and daughter last week, then setting his North Bend home on fire. Deputies were able to track him to a bunker he has been building for the past 8 years on Rattlesnake Ridge.

Swat teams surrounded the bunker on Friday. Overnight, they said they were able to see lights go on inside the hideaway. Deputies believe Keller has a portable generator inside the bunker.

The terrain around the bunker is incredibly difficult. Several Swat Team members had to be treated after coming down from the mountainside. One deputy severely sprained an ankle, others were dehydrated and were given I.V. fluids.

The hostage negotiator is expected to arrive this morning. The negotiator will be using a bull horn to try and make contact with Keller. Keller is believed to have a number of firearms with him. King County Sheriff's Office says deputies are prepared to wait, possibly even days, during this stand-off.

Police: Keller was 'preparing for the end of the world'

Probable cause documents reveal Keller said he was preparing for the end of the world and had often carried supplies to a fort in the woods. Court documents also reveal that:

  • The fire was set by placing a plastic gas can into a skillet on the stove and turning on the burner
  • Keller was known to have a gun collection and body armor - all the weapons were missing from the home
  • Keller had withdrawn $6,200 in cash from his bank account on Friday
  • The safe in the home was left open, as was the door of a shed
  • Keller purchased a new laptop computer within the last two weeks
  • Keller's mountain bike is missing

Family members said Keller, considered a capable and well-equipped outdoorsman, has a survivalist mentality and a distaste for authority. Authorities consider Keller armed and extremely dangerous.

Investigators have posted posters at many trailheads near North Bend in the I-90 corridor, asking if anyone has spotted Keller's truck, but also warning people to not go near him and instead immediately call 911.

Rattlesnake Ridge Trailhead is closed to the public, but other trails remained open.

KING 5's Jim Forman, Liza Javier and Eric Wilkinson contributed to this report.

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