An overturned semitrailer rests on its side on the eastbound lanes of 

An overturned semitrailer rests on its side on the eastbound lanes of Interstate 40, just east of El Reno, Okla., after a reported tornado touched down, Friday, May 31, 2013. (AP Photo/The Omaha World-Herald, Chris Machian) MANDATORY CREDIT
Associated Press
An overturned semitrailer rests on its side on the eastbound lanes of Interstate 40, just east of El Reno, Okla., after a reported tornado touched down, Friday, May 31, 2013. (AP Photo/The Omaha World-Herald, Chris Machian) MANDATORY CREDIT
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