Two firefighters break through concrete during the search for survivors in the remains of the Plaza Towers Elementary School in Moore, Oklahoma, in this handout picture taken May 20, 2013. Emergency workers pulled more than 100 survivors from the rubble of homes, schools and a hospital in an Oklahoma town hit by a powerful tornado, and officials lowered the death toll from the storm to 24, including nine children. Maj. Geoff Legler/Oklahoma National Guard/Handout via Reuters (UNITED STATES - Tags: DISASTER ENVIRONMENT TPX IMAGES OF THE DAY) ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY.
WASHINGTON, DC - MAY 21: A U.S. flag flies at half staff on the U.S. Capitol May 21, 2013 on Capitol Hill in Washington, DC. Speaker of the House Rep. John Boehner (R-OH) has ordered flags to fly at half staff to remember the victims who were killed by a powerful tornado in Oklahoma.
MOORE, OK - MAY 20: In this handout provided by the U.S. Department of Defense, U.S. Soldiers and Airmen with the Oklahoma Army National Guard and the Oklahoma Air National Guard along with firefighters participate in recovery efforts after a tornado moved through on May 20, 2013 in Moore, Oklahoma. The town reported a tornado to be at least EF4 strength and two miles wide that touched down Monday killing at least 24 people and leveling everything in its path. U.S. President Barack Obama promised federal aid to supplement state and local recovery efforts.
MOORE, OK - MAY 20: In this handout provided by the U.S. Department of Defense, two firefighters break through concrete during the search for survivors in the remains of the Plaza Towers Elementary School after it was hit by a tornado on May 20, 2013 in Moore, Oklahoma. The town reported a tornado to be at least EF4 strength and two miles wide that touched down Monday killing at least 24 people and leveling everything in its path. U.S. President Barack Obama promised federal aid to supplement state and local recovery efforts.
The storm system that generated an F-4 tornado in Moore, Oklahoma is pictured in this May 20, 2013 NASA handout photo shortly before the tornado struck. The image was taken by NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) instrument aboard one of the Earth Observing System (EOS) satellites. The Moore tornado killed at least 24 people, and injured more than 200 others. NASA/Goddard/Jeff Schmaltz/MODIS Land Rapid Response Team/Handout via Reuters (UNITED STATES - Tags: DISASTER ENVIRONMENT) ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY.
MOORE, OK - MAY 21: The school zone sign for Plaza Towers Elementary school stands at an angle after the area was damaged by a tornado May 21, 2013 in Moore, Oklahoma. The town reported a tornado of at least EF4 strength and two miles wide that touched down yesterday killing at least 24 people and leveling everything in its path. U.S. President Barack Obama promised federal aid to supplement state and local recovery efforts.
