An injured firefighter is wheeled from the scene after a building was leveled by an explosion in downtown Springfield, Mass. on Friday, Nov. 23, 2012. (AP Photo/Springfield Republican, Don Treeger) MANDATORY CREDIT

Associated Press
An injured firefighter is wheeled from the scene after a building was leveled by an explosion in downtown Springfield, Mass. on Friday, Nov. 23, 2012. (AP Photo/Springfield Republican, Don Treeger)  MANDATORY CREDIT
An injured firefighter is wheeled from the scene after a building was leveled by an explosion in downtown Springfield, Mass. on Friday, Nov. 23, 2012. (AP Photo/Springfield Republican, Don Treeger) MANDATORY CREDIT
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