A tornado touches down near El Reno, Okla., Friday, May 31, 2013, 

A tornado touches down near El Reno, Okla., Friday, May 31, 2013, causing damage to structures and injuring travelers on Interstate 40. I-40 has been closed after severe weather rolled through the area. (AP Photo/The Omaha World-Herald, Chris Machian) MANDATORY CREDIT
Associated Press
A tornado touches down near El Reno, Okla., Friday, May 31, 2013, causing damage to structures and injuring travelers on Interstate 40. I-40 has been closed after severe weather rolled through the area. (AP Photo/The Omaha World-Herald, Chris Machian) MANDATORY CREDIT
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