Several people called 911 about 5am on Monday to report a shooting in Fall City, King County Sheriff's Office spokesperson Mike Mellis said at a media briefing on Monday afternoon.
Arriving deputies immediately took a 15-year-old boy into custody while another teenager who had been hurt was taken to a Seattle hospital. Both teens live at the house, Mellis said.
Deputies entering the home found the bodies of five people. Two were adults and three were described by Mellis as young teenagers. No names have been released yet.
"Once bodies were discovered, clearly we understand that this is a hugely significant crime scene," he said.
Mellis said the shooting appears to involve members of a family, but added they didn't yet know how they were related. He also said there was no ongoing threat to the community.
"I have no reason to think that there will be any additional arrests," he said.
The teen in custody was booked into King County's juvenile detention facility, according to Mellis. He will appear in court for a first hearing on Tuesday or Wednesday, a spokesperson for the county Prosecuting Attorney's Office said.
A neighbour told KING-TV that a couple and their five children lived in the home.
"I'm just in total shock, I keep bursting into tears," Lynne Trowern, told the news outlet.
An emailed statement Monday evening from King County Councilmember Sarah Perry said the shooting involved a family of seven people.
Sheriff Patricia Cole-Tindall told KING-TV that she was "very sad, very disturbed" to learn about the shooting.
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