kentucky was hit the hardest, with four tornadoes striking there. these drone images shows many properties in rural areas were completely levelled. two people are confirmed to have died in arkansas. one of those was killed when this nursing home was hit, with five others left injured. us occupational safety and health administration have opened an investigation into safety at this amazon facility, located in edwardsville, illinois, after six of its workers were confirmed to have died. survivors describe being alerted to the incoming storm 20 minutes ahead of it striking the facility, with some reporting they told to shelter in place in a toilet for over two house — a claim disputed by amazon. the logistics giant say due to the nature of facility it's obviously a large facility — it's1.1 million square feet — but there are shelter—in—place areas and they're designed for that purpose. so, when the alarm went off, when the siren went off, our staff immediatelyjumped into action, started moving people, trying to get everybody into those shelter—in—place areas. let's return though to disaster ground zero in mayfield, kentucky, with cbs news correspondent laura