A tornado has hit the town of Greensburg in Kansas, USA, wiping out 95% of the buildings, killing at least 9 people and injuring 60 others.
Look at the links below for more information and images / video.
http://www.usatoday.com/weather/storms/tornadoes/2007-05-05-kansas_N.htm This includes a flash animation of 'how tornadoes form'. The videos are definately worth a look.
