SAN FRANCISCO -- Five people, including three children, were killed Monday in the US state of Washington, and a teenage suspect was taken into custody, authorities said.

Law enforcement responded to multiple 911 calls shortly before 5 am local time (1200 GMT) about a shooting at a home in Fall City, Washington state, King County Sheriff's Office spokesperson Mike Mellis said.

A neighbor helped one of the victims, a teenager, who was injured and later taken to hospital for treatment. Other victims were able to call police from a bathroom inside the home, where they hid during the shooting.

There were no further details regarding the extent of the victims' injuries or deaths, Mellis said. The King County medical examiners have arrived at the scene and will release the identification of the victims once autopsies are completed.

The teenage suspect was taken into custody and remains at the King County Juvenile Detention Center, Mellis said. He could potentially face charges of first-degree or second-degree murder.