A tornado with a magnitude of E-4 hit Oklahoma on May 20, killing at least 24 residents in Moore and Oklahoma City, including children at an elementary school. Oklahoma City Manager Jim Couch told CBS News that search and rescue operations were under way.

"We need patience at this point in time," Couch told Scott Pelley of CBS News. "We have a significant public safety force here. They are engaged. We have a great volunteer community, a great medical community and everyone is engaged. Unfortunately, this is not the first tornado we have had, so we are fairly well trained in our responses to them."

City officials in Joplin, Missouri, devastated by a tornado two years ago, said they were sending a team to Moore to help.