Officials say smoking caused an oxygen tank to explode in a Corapolis home, injuring a husband and wife. Coraopolis Fire Chief Larry Byrge tells the Pittsburgh Tribune-Review that a 59-year-old woman was smoking in a house when the tank exploded around 10:00 last night. He says the woman was severely burned and her 60-year-old husband burned his hands while trying to help her. No word on their conditions.