Wednesday, March 4, 2020 - 16:06
In Nashville, Tennessee's biggest city, the tornadoes caused widespread damage to homes and other buildings.
The storm hit after midnight and moved so quickly that many people sleeping didn't have time to take shelter, US media reports.
President Donald Trump has said he plans to visit the state on Friday.
A number of people remain unaccounted for, Governor Lee said in a press conference.
The scene in Nashville is "like a war zone" one resident told the BBC.
Two others, David Haskell and his wife, sprinted into a storm shelter when emergency alarms went off on their phones.
(Source: BBC News)
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