Sacramento Metro Fire District is investigating a suspicious fire that happened Sunday morning in Fair Oaks and believe it might be a case of arson. Four cars and a retirement home apartment were destroyed in the fire and Fire officials said there was evidence at the scene that led to the determination of suspected arson. The fire started at about 5 AM on the 8700 block of Madison Avenue and originated near one of the cars then spread to the apartment. There were people in the retirement home but there no reported injuries.