Deadly gas explosion in Wisconsin suburb prompts evacuations

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A natural gas explosion in Sun Prairie, Wisconsin, on Tuesday killed one firefighter responding to the scene, levelled at least one building and prompted evacuations of homes and businesses within a half-mile radius. Authorities say contractors were working downtown when they struck a natural gas line. Officials say while teams perform a search through the rubble, there isn't a timetable yet for when people will be allowed back into the evacuation zone, NBC's Ron Mott reports for TODAY.