Sparta authorities were rousting people out of a neighborhood Wednesday at about 7:00 p-m due to a dangerous house fire.  Sparta Area Fire District Chief Mike Arnold says the fire started in a garage, then spread to the house.  There were two vehicles in that garage, along with 50-to-60 tires.  Arnold says that fuel load meant it was a very hot fire when crews arrived.  There were some reports of explosions, making the evacuations necessary.  Exterior heat damage was done to nearby buildings.  No injuries were reported and neighbors were allowed to return to their homes after a little over one hour.