The Verso Paper Corporation is being fined nearly $40,000 by the Occupational Safety and Health Administration for safety violations that led to a deadly explosion in May.
The Associated Press reports the state fire marshal's investigation found an overheated compressor that caused the explosion and fire. Employees reportedly shut down a well used to cool the plant's compressors on the day of the accident.
Oil inside the compressor reached a temperature of 308 degrees, the St. Cloud Times says. Normal operating temperature for compressor oil is about 150 degrees.
Fifty-year-old Jon Maus of Albany, Minn., was killed and four others were injured.