A school crossing sign is lodged in the tornado rubble outside Plaza Towers elementary school in Moore, Okla., Monday, May 27, 2013. (AP Photo/Sue Ogrocki)

Associated Press
A school crossing sign is lodged in the tornado rubble outside Plaza Towers elementary school in Moore, Okla., Monday, May 27, 2013. (AP Photo/Sue Ogrocki)
A school crossing sign is lodged in the tornado rubble outside Plaza Towers elementary school in Moore, Okla., Monday, May 27, 2013. (AP Photo/Sue Ogrocki)
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