Watertown Fire Rescue responds to a structure fire at 10:20 pm on 2-15-21. Fire was at 909 12th Ave NW in Watertown SD. Upon arrival crews found that the fire in the mobile home had self vented from the windows and door on the north and east side of the structure in several location. Portable heating caused the blaze. Everyone escaped the home however the mobile home and possessions were destroyed by the fire.