Steven Sohlstrom, FlightFlash.com

Read the Full OSHA Report on Verso Investigation

SARTELL - The Minnesota Occupational Safety and Health Administration has closed its investigation into the explosion and fire at the Verso Paper Mill.

OSHA cited Verso for two serious citations.  They were fined a total of $39,200, which the company did not contest and paid.

James Honerman is the Communications Director for the Minnesota Department of Labor and Industry.  He says the first violation was for failing to ensure specific "lockout/tagout procedures".

An overheated compressor led to the explosion and fire.

Plant employees, doing routine maintenance, shut down a well that provided water to cool the plant's compressors on the day of the accident.

The explosion and fire on Memorial Day killed Jon Maus, and injured four other workers.

The company announced in August it would not reopen the mill.