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The Tucson Mountains are seen in Tucson, Arizona on May 15, 2015. AFP PHOTO/ BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

The Tucson Mountains are seen in Tucson, Arizona on May 15, 2015. AFP PHOTO/ BRENDAN SMIALOWSKI        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)