A combination of images from GeoEye's IKONOS high-resolution satellite, made available to Reuters on April 29, 2011, shows an overview of the path of destruction after a massive tornado touched down in Tuscaloosa, Alabama, on April 28, 2011 (L) and an image taken April 4, 2006. President Barack Obama promised federal aid on Friday to the tornado-ravaged U.S. South, where deadly twisters have killed at least 339 people and caused billions of dollars in damage. Flying into Tuscaloosa, where a tornado touched down on April 27, 2011, Obama and his family saw a wide brown scar of devastation several miles long and hundreds of yards wide.