An investigator from the state fire marshal’s office is in Starke County to determine the origin and cause of a house fire yesterday north of Knox. The home on 175 North just east of U.S. 35 was fully engulfed when firefighters arrived, according to Knox-Center Township Fire Chief Kenny Pfost. He says they were notified at 2:16 p.m. but were responding to a woods fire at the time. Pfost immediately requested assistance from Hamlet and Washington Township due to their extended arrival time. The Koontz Lake Volunteer Fire Department also provided water and manpower support. No injuries were reported, and the home was believed to be unoccupied. Firefighters were on the scene for three hours.