Kansas City gas explosion

Associated Press
Utility workers repair gas lines near a building that exploded and caught fire in the Plaza shopping district of Kansas City, Mo., Tuesday, Feb. 19, 2013. (AP Photo/Orlin Wagner)

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A day after a natural gas explosion leveled a popular restaurant, investigators raced to search the rubble and tried to understand how the blast happened despite suspicions that flammable fuel had been leaking, maybe for weeks, somewhere in the busy outdoor shopping area.

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