VIDEO: An investigation is underway into a fire at a multi-family home on De Pere’s west side Wednesday. De Pere Fire-Rescue Battalion Chief Jack Mlnarik says four people escaped the home in the 800-block of Ash Street. One person from the upper unit was injured during evacuation and taken to a hospital for medical treatment. Mlnarik says early on it appears the fire started on the first floor in the kitchen area. He said the two-story wood frame house had been remodeled many times and the flames spread through the walls and ceiling areas. He noted the ceiling was particularly difficult to reach. There was extensive fire, smoke and water damage to the upper and lower units. Due to the fire conditions inside the home, crews at to battle the blaze from outside. A Green Bay battalion chief said crews had a hard time putting out the fire due to the cold.