Emergency personnel load a Gerdau steel mill employee into an ambulance after a blast furnace exploded at the Knoxville plant.
Photo by The Knoxville News Sentinel /Chattanooga Times Free Press .
published Friday, May 16th, 2014
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KNOXVILLE — Investigators on Friday tried to determine what caused an explosion at a Knoxville, Tennessee, steel mill that injured six workers and could be heard by residents from blocks away.