Massive tornado kills dozens

** CORRECTS DATE TO May 23 ** An emergency worker searches a Walmart store that was severely damaged by a tornado in Joplin, Mo., Monday, May 23, 2011. A large tornado moved through much of the city Sunday, damaging a hospital and hundreds of homes and businesses. (AP Photo/Charlie Riedel) <span class=meta>(AP Photo/ Charlie Riedel)</span>
May 23, 2011 10:36:37 AM PDT