Millions in danger as tornadoes hit the USA

Millions of Americans are at risk of severe flooding after more than a dozen tornadoes hit a number of states including Texas and Oklahoma, authorities have warned.

On Monday at least 19 tornadoes caused scattered damage and a deluge of rain, sparking flooding and causing damage to buildings and vehicles.

The US National Weather Service warned more bad weather could be on the way, and more than 4 million people were under a flash-flood warning or watch on Tuesday.

“More tornados are on the way today, most likely late this afternoon into the evening,” Rich Otto, a forecaster for the National Weather Service said, adding the warnings stretched from Texas, Oklahoma and Kansas eastwards to Arkansas and southwest Missouri.

Watch the video above to see dramatic footage of the tornados in Oklahoma