Korean news agency Yonhap News is reporting that a gas leak at a Samsung plant in southern Seoul has left one worker dead. A malfunction in the factorys fire extinguishing system released carbon dioxide after it mistakenly detected fire, asphyxiating a 52-year-old man working in the area. Its the latest in a string of accidents at Samsung facilities over the past year, raising questions over the safety of Samsungs operations in South Korea.