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Kansas City gas explosion

Associated Press
An ATF agent and other investigators look down a hole in an alley near JJ's restaurant after an explosion and fire tore through the establishment Tuesday evening near the Country Club Plaza Wednesday, Feb. 20, 2013, in Kansas City, Mo. The fire killed one person and injuring over a dozen. (AP Photo/Ed Zurga)

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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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