( CNN ) -- 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 . Score: 7
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 . Score: 7