Federal workplace safety officials are investigating a fatal fire at a South Dakota ethanol plant.
One person was killed and another injured in the May 6 fire at a POET Biorefining plant south of Hudson.
The cause of the fire hasn't been determined, but the Occupational Safety and Health Administration says the worker who died was welding inside a tank at the time. The welder was flown to a Minnesota burn hospital, where he died. The other worker was treated at a hospital and released.
The Argus Leader newspaper reports that both contractors were employed by Bismarck, North Dakota-based Bilfinger Westcon Industries. Neither employee's name has been released.
POET Biorefining issued a statement expressing condolences to family, friends and co-workers.