DULUTH, MN (KDAL) - Duluth fire crews were called by neighbors to a house at 614 North 3rd Avenue East around 11 on Wednesday night. When they arrived the building had smoke coming from all sides and heavy fire coming from the front windows on the first floor. Crews remained on the scene for about 3 and a half hours extinguishing pockets of fire. Nobody was home at the time of the fire and the house and its contents are considered a total loss. Damage estimates are in excess of 75 thousand dollars. The cause of the fire is under investigation by the Duluth Fire Marshal's Office.