DULUTH, MN (KDAL) - Just after 4 on Friday morning, the Duluth FIre Department responded to reports of a garage fire at 3162 Vernon Street.  When they arrived, the firefighters from Lincoln Park located and quickly extinguished two small fires burning on the exterior of a detached residential garage.  The fire damage was estimated at around 2500 dollars and investigators determined that the blaze was caused by arson.  Anyone with information concerning the fire is asked to call the Duluth Fire Marshal's office at 218-730-4399 or contact Duluth Police.