Storm clouds are seen over Denver International Airport on Tuesday, June 18, 2013, where a tornado touched down and forced passengers and employees into shelters. No one was injured and there was no ... more 
Storm clouds are seen over Denver International Airport on Tuesday, June 18, 2013, where a tornado touched down and forced passengers and employees into shelters. No one was injured and there was no apparent damage. (AP Photo/Ed Andrieski) less 
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Associated Press | Photo By Ed Andrieski
Tue, Jun 18, 2013 6:13 PM EDT