Baden firemen were called to a fire in the 400 block of Prospect St. after 6 a.m. on Monday. According to Beaver County Radio News Correspondent Sandy Giordano, officials investigating the fire now know what caused the blaze. Fire chief Dennis Baker said a female resident  placed a heating pad in the microwave  for longer than necessary causing a small kitchen fire. The resident was taken for treatment  at a local hospital for smoke inhalation by  her daughter and son-in-law, Chief Baker said.