14 fire units from engines to marshals responded to 9640 48th Av s.w. this morning to a residential fire. The first 911 call came at 7:56 a.m.

The Red Cross will be providing assistance to one person which could include shelter, food, clothing and other immediate needs.

Seattle Firefighters will be at the house for some time to put out hot spots (they arrived at 8 a.m.). No injuries have been reported.

Update for 10:30 a.m.:
According to Lt. Sue Stangl with the Seattle Fire Department firefighters arrived at the scene just before 8 a.m. and there were "full flames through every window." Everyone was out of the house by the time firefighters arrived and one adult male is being aided by Red Cross.

The house was set up with an automatic fire alarm (which Lt. Stangl said is rare for a residential house)that firefighters initially responded to, followed by several calls from neighbors.

Lt. Stangl said, upon determining the house was a loss, firefighters began concentrating on containing the fire to keep it from spreading to neighboring houses.

Update 2
Firefighters have moved out of the collapse zone and are letting the roof collapse so the water from hoses will be more effective in combating lingering hot spots.

Update 3
According to an official tweet from the department, SFD investigators will not be able to determine the cause of the fire. The structure is too unstable to make entry. The loss has been set at $300,000.