Article Photos: Oklahoma City mayor says 12,000 to 13,000 homes damaged or destroyed by May 20 tornado 326/564

Briarwood Elementary staff members receive a standing ovation during a district-wide meeting of Moore Public Schools employees at Southern Hills Baptist Church, 8601 Pennsylvania Ave., in Oklahoma City, Wednesday, May 22, 2013. The school was destroyed when a tornado struck south Oklahoma City and Moore, Okla., on Monday. Photo by Nate Billings, The Oklahoman