Oklahoma tornadoes: President Barack Obama to visit Oklahoma on Sunday - Article Photos 299/549

Plaza Towers Elementary staff members sit in the balcony as they 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. Seven children were killed and the school was destroyed when a tornado struck south Oklahoma City and Moore on Monday. Photo by Nate Billings, The Oklahoman