Parts of trees and household debris cover the ground after a huge tornado struck Moore, Oklahoma, near Oklahoma City, May 20, 2013. A massive tornado tore through the Oklahoma City suburb of Moore on Monday, killing at least 51 people as winds of up to 200 miles per hour (320 kph) flattened entire tracts of homes, two schools and a hospital, leaving a wake of tangled wreckage. REUTERS/Richard Rowe (UNITED STATES – Tags: DISASTER ENVIRONMENT
A woman is pulled out from under tornado debris at the Plaza Towers School in Moore, Okla., Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) 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 Sue Ogrocki)
REFILE – CORRECTING GRAMMAR IN FIRST SENTENCE Rescue workers help free one of 15 people trapped in a medical building at the Moore hospital complex after a tornado tore through the area of Moore, Oklahoma May 20, 2013. REUTERS/Gene Blevins (UNITED STATES – Tags: ENVIRONMENT DISASTER)