(Portland, OR) -- Portland Fire Investigators want to talk with a person of interest in a three-alarm house fire Sunday night in the Humboldt Neighborhood. Witnesses saw a white man wearing a light-colored shirt, shorts and baseball cap, driving a two-door, black convertible, coupe, parked directly across from the fire location. The man was standing around and may have met up with a female shortly before leaving the area. They don't believe the person was involved in the fire but might have information for the investigation.