The city of West on Friday sued the owner and supplier of the fertilizer plant that exploded in April, killing 15 people and inflicting as much as $100 million in property damage on the small town. The lawsuit, which seeks unspecified damages, accuses the company that owned West Fertilizer Co. — Adair Grain Inc. — and the company that supplied ammonium nitrate — CF Industries — of negligence. Adair Grain is accused of being negligent in the way it stored ammonium nitrate, the volatile chemical used as a fertilizer that investigators say exploded after a fire broke out at the plant April 17.