Explosion preceded the massive fire.
7-Sigma president accuses firefighters of taking no action to save his business.
Video shows suspects committing arson at the scene
Flames burned deep inside massive pile of scrap metal
Change in refinery fire protection raises concerns among city officials.
The yard owner Northern Metals has been sharply criticized by state's governor.
Firefighters plan to cut a fire break through the crushed vehicles.
A Minnesota refinery brigade unites management, personnel, and the community in its protection strategy.
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