CNN — A man who police believe killed his grandparents over the weekend was holed up Tuesday in an Oregon hotel room, refusing to come out, a local police chief said.
Police are negotiating with a man they believe is 26-year-old Michael Boysen, said Lincoln City, Oregon, police Chief Keith Killian. The hotel in the coastal Oregon city, about 90 miles southwest of Portland, has been evacuated, and 20 to 25 law enforcement officers are on the scene.
A hotel clerk called in a tip around 7:30 a.m. (10:30 a.m. ET) after recognizing a man who had checked in the previous night from a television news report. According to Killian, the suspect checked in using his real name.
Boysen was released last Friday from the Monroe Correctional Facility in Washington state, where he served a year behind bars for burglary.
His grandparents picked him up, drove him around running errands, and held a gathering for family members at their home to welcome him back, said King County Sheriff John Urquhart.
The next day, the grandparents were found dead.
After Boysen and his grandparents did not respond to phone calls Saturday, his mother drove over with a key to the house in Renton, Washington, near Seattle, and found the couple's bodies.
Boysen and his grandparents' car were missing.
Authorities have not said how the victims were killed. A gun was not used, but the deaths were violent, they said.
During the course of their investigation, detectives said they learned that Boysen had talked about killing his grandparents, acquiring guns and going after authority figures. He had searched in the Internet for gun shows across the Pacific Northwest and Nevada.
"We need to do everything we can to get this man off the street as soon as possible," Urquhart said. "His threats against authority figures make him very dangerous and unpredictable."