Article Photos: Oklahoma tornadoes: President Barack Obama to visit Oklahoma on Sunday 427/548

This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch) ORG XMIT: OKSG101