This image from video provided by KMOV-TV in St. Louis shows an injured worker being helped into an ambulance outside the American Steel plant in Granite City, Ill., Thursday, March 7, 2013, where an ... more 
This image from video provided by KMOV-TV in St. Louis shows an injured worker being helped into an ambulance outside the American Steel plant in Granite City, Ill., Thursday, March 7, 2013, where an explosion injured at least 10 people, three critically. (AP Photo/Courtesy KMOV-TV in St. Louis) TELEVISION OUT less 
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Associated Press | Photo By Courtesy KMOV-TV in St. Louis
Thu, Mar 7, 2013 1:32 PM EST