May 21, 2013 -- Updated 1220 GMT (2020 HKT) Edited by Nick Thompson in London

  • At least 51 dead, but 40 more expected
  • Tornado hit Oklahoma with little warning
  • 20 children killed; school in direct path
  • 2-mile-wide twister on ground for 45 minutes

WATCH VIDEO NOW: The death toll continues to rise in Oklahoma after a huge tornado tore through a highly populated area, wiping out entire neighborhoods, schools and other buildings. WATCH | TORNADO PHOTOS | ON THE GROUND

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