Kansas City gas explosion

Associated Press
Fire and smoke rise at an upscale shopping district in Kansas City, Mo., where a city official said a gas explosion sparked a block-engulfing blaze, Tuesday evening, Feb. 19, 2013. (AP Photo/The Kansas City Star, Keith Myers) KANSAS CITY OUT

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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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