The governor of the US state of Kentucky has said that more than 70 people were killed by tornadoes.
Andy Beshear says the figure could rise to more than 100 in what he called the worst tornadoes in the state's history.
Dozens are feared dead inside a candle factory in the town of Mayfield.
At least five people died as tornadoes wreaked havoc in other states, including one in an Amazon warehouse in Illinois.
Beshear has declared a state of emergency in Kentucky.