At one point police officers were seen going into an adjacent room. Earlier in the day, police had sent a small robot up some stairs and onto a balcony of the motel.
Rooms at the motel were quietly evacuated and surrounding streets were closed off. Nearby residents were told to remain in their homes, and a growing number of officers converged on the motel.
Boysen checked into the motel Monday night under his own name, but the name wasn't recognized until Tuesday morning when a desk clerk saw a television story about the case and called the Lincoln City police, Kilian said.
A State Police negotiator used a bullhorn to talk to the man, but hadn't made headway.
"He asked for us to leave, that's about it," Kilian said.
Officers haven't seen the man display any weapons, he said.
Boysen, 26, made threats against members of his family and law enforcement while behind bars, Corrections Department spokesman Chad Lewis said Tuesday. But authorities didn't learn of the threats until after the bodies of the grandparents were found and authorities had started looking for Boysen.
"Sources went to our staff at the Monroe Correctional Center and told us he had been threatening to do all this," Lewis said.
The information was passed on to King County deputies, and that's why King County Sheriff John Urquhart called Boysen extremely dangerous at a Monday news conference.