Houses damaged and destroyed by a tornado over the weekend are seen in Picher, Oklahoma

 
Houses damaged and destroyed by a tornado over the weekend are seen in Picher, Oklahoma
Houses damaged and destroyed by a tornado over the weekend are seen in Picher, Oklahoma, May 12, 2008. Tornadoes killed at least 21 people and injured hundreds as they ripped through the central and southeastern United States over the weekend, destroying homes, overturning cars and downing trees and power lines. Six people were killed in the small northeastern Oklahoma town of Picher, officials said. REUTERS/Mark Schiefelbein (UNITED STATES)