TUCSON—A gunman killed one person and wounded four others, including firefighters and paramedics, at the scene of a house fire in Arizona on Sunday before being shot by an officer, authorities said. The 35-year-old suspect, who was critically wounded and remains hospitalized, drove up to the fire and shot at an ambulance crew around 3:45 p.m., Tucson Police Chief Chris Magnus told news outlets. The ambulance driver, a 20-year-old man, was shot in the head, and a paramedic in the passenger seat, a 21-year-old woman, was shot in the chest and arm. The driver was in critical condition and the woman was stable. The suspect also opened fire on firefighters and neighbors trying to douse the flames, the chief said. One neighbor was shot in the head and died. A firefighter was shot in the arm, and another bullet grazed another neighbor’s head. A “badly burned” body was found inside …