3 Dead, 1 Injured, at House Party Shooting in Seattle Suburb

— -- Three people are dead and one injured following a shooting at a house party in Mukilteo, Washington, a suburb of Seattle located about 25 miles north of the city, police said early Saturday morning.

A suspect -- apprehended in Lewis County, south of Seattle -- is in custody, the city of Mukilteo tweeted.

"There was a shooting tonight in the Chennault neighborhood," the city tweeted at 2:40 a.m. local time, subsequently adding that between 15 and 20 people were present at the home.

Thirty minutes later, the city tweeted, "We are sad to report 3 fatalities tonight, 1 injured and transported to Harborview [Medical Center in Seattle], we do not know the extent of injuries."

The victims' names will not be released until they are identified and next of kin are notified, officials said.

Local police said it also established a "reunification center" for parents and relatives of party-goers at a local church.

ABC News' Alex Faul, Rex Sakamoto, Devin Villacis contributed to this report.