The Latest on the Washington state shooting (all times local):

9:15 a.m.

Authorities in Washington state on Sunday say a man is in custody and they're not actively looking for other suspects following a gunman's attack on a gathering of young adults that left three dead and another wounded.

Police say the shooting took place at a home in the Seattle suburb of Mukilteo early Saturday. State troopers say they later pulled over and arrested the fleeing 19-year-old suspect on an interstate more than 100 miles away.

Police did not immediately release his name but Allen Christopher Ivanov was booked into the Snohomish County Jail on Saturday afternoon for investigation of three counts of murder.

Mukilteo Police Department Officer Myron Travis says there's no reason to believe there are other suspects.

Authorities have not released the names of those who were shot.