July : Blast at Bayer AG plant kills one person , wounds another . Police extinguish fire about two hours after blast . People asked to stay indoors after explosion raised concerns about air quality . Plant produces crop - protection chemicals .
NEW : Blast at Bayer CropScience plant kills one person , injures another . Firefighters extinguish fire about four hours after blast . Residents asked to remain indoors after explosion raised concerns about air quality . Plant produces crop-protection chemicals .