Article Photos: Oklahoma tornado: EF5 tornadoes like Monday's are very rare 201/548

Plaza Towers 3rd-grade teacher Cheryl Littlejohn hugs 4th-grader Tori Roysdon, 11, during a meet and greet with teachers and students from Plaza Towers Elementary at Eastlake Elementary School in Oklahoma City, Thursday, May 23, 2013. Seven Plaza Towers students died when a tornado destroyed the school in Moore, Okla., on Monday. Photo by Nate Billings, The Oklahoman