More people are thought to have been killed as tornadoes hit southern states of the US for the second night in succession.

Six deaths were reported in Alabama and seven in Mississippi after twisters struck last night, although not all of the fatalities were confirmed.

Several tornadoes flattened buildings, overturned vehicles and brought down utility lines on a second consecutive night of devastation, the BBC reported

At least 16 people died in Arkansas, Iowa and Oklahoma on Sunday night.

Jason Shelton, the mayor of Tupelo in Mississippi, told CNN the damage from the storms was widespread and “devastating”.