Massive Tornado Hits Oklahoma
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A man stands among the wreckage in Moore, Oklahoma, May 20, 2013
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Storm chaser Brad Mack records the tornado in Oklahoma.
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The storm system that generated an F-4 tornado in Moore, Oklahoma is pictured in this May 20, 2013 NASA photo.
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John Warner surveys the damage near a friend's mobile home in the Steelman Estates Mobile Home Park, destroyed in a tornado, near Shawnee, Oklahoma, May 20, 2013.