Kentucky governor Andy Beshear says up to 100 people could be dead in the state as casualties also reported from other states.

At least four tornadoes touched down overnight across Kentucky, causing significant damage in more than a dozen counties. The primary tornado travelled more than 227 miles (365 km) across the state.

Some of the worst destruction was in Mayfield in western Kentucky.

About 110 people were inside a candle factory in the area when the tornado ripped through, taking down the roof, Beshear said.