The investigation into the cause of a fire at 220 South Franklin Street in Janesville is now in the hands of police and the fire marshall. Officials say the cause is considered suspicious. Firefighters say they found flames coming from both levels of the two-story when they arrived a little before 6:00 a.m. Thursday. Police officers were already on the scene and reported all occupants had escaped. The structure and contents are a total loss. The Red Cross is assisting the family.