Duluth, MN (KDAL) - There was a house fire in Duluth last night.  Crews were called out around five o'clock to a residence AT 2429  East Second Street.  When the trucks pulled up they found that the back porch was on fire and the flames extended up the side of the house.  It was quickly put out but crews spent about an hour extinguishing hot spots inside the wall and floor spaces.  Intitial damage estimates are set at 25 thousand dollars.  The cause of the fire is under investigation.