Article Photos: Oklahoma City mayor says 12,000 to 13,000 homes damaged or destroyed by May 20 tornado 458/564

Alli Christian, left, helps Jessica Wilkinson as she looks for her dog Bella after Wilkinson returned to find her home near 156th street and Franklin Road destroyed by a tornado on Sunday, May 19, 2013  in Norman, Okla. Photo by Steve Sisney, The Oklahoman