A fatal house fire in the northwest killed several people; and officials are still investigating. Authorities say at least six people are dead following a house fire in Vancouver, Washington, early Sunday morning.  Firefighters discovered the bodies after extinguishing the blaze that had engulfed the home on Northeast 13th Circle. Witnesses report hearing an explosion and seeing flames shoot 30 feet into the air from the home.  Vancouver police say the cause of the fire hasn't yet been determined.