This image from video provided by KMOV-TV in St. Louis shows an injured worker is helped into a helicopter outside the American Steel plant in Granite City, Ill., Thursday, March 7,

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This image from video provided by KMOV-TV in St. Louis shows an injured worker is helped into a helicopter 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
Fri, Mar 8, 2013 6:05 AM EST