$90 thousand damage in a house fire this morning on the 300 block of Avenue G South. The Saskatoon Fire Department says it was arson. Crews were called out around 3:30 and found a shed at the rear of the home fully ablaze. The fire had extended into the boarded up house, crawling up into the second floor of the building. No one was inside. It took 40 minutes to bring the blaze under control.