Article Photos: Oklahoma City mayor says 12,000 to 13,000 homes damaged or destroyed by May 20 tornado 490/564

Alli Christian, left, returns Jessica Wilkinson's dog Bella to her after finding her among the wreckage of Wilkinson's home shortly after a tornado struck near 156th street and Franklin Road on Sunday, May 19, 2013  in Norman, Okla. Photo by Steve Sisney, The Oklahoman