Update, 9:40 a.m.: All tracks have now reopened, according to Sound Transit.
The man in the tree was allegedly involved in a domestic violence incident had climbed about 40 feet up, where he remained for several hours, KIRO TV reported. He eventually climbed down and was taken into police custody.
Original post, 8:24 a.m.: Police activity is currently blocking all Northline Sounder trains between Edmonds and Seattle, Sound Transit is reporting on Twitter.
Buses are picking up stranded passengers in Edmonds, the transit agency said.
The delay is being caused by a man in a tree near tracks in Magnolia, according to Sgt. Cindi West of the King County Sheriff's Office. Seattle Police have said the man might be connected to a property damage case.
Amtrak trains traveling through the area are also delayed, West said.
This is a developing story. Check back with Patch for updates.