Aerial footage shows tornado devastation in Texas

At least 11 people have been killed by tornadoes in Texas including five people who died when their cars were blown off a motorway.

The worst-hit area was in Garland, northeast of Dallas, where eight people were killed and several hundred homes flattened, officials said.

Five of the deaths in Garland happened when cars were struck by a tornado while on the motorway.

More than 600 structures in North Texas suffered damage from the tornadoes and storms, officials said.

Six tornadoes were reported in Texas and one in Oklahoma on Saturday, the National Weather Service said.

The service has issued severe weather warning for large parts of the central United States that include a blizzard warning for parts of New Mexico, Texas, Oklahoma and Kansas and a flash flood watch stretching from Texas to Ohio.

Several hundred flights have also been cancelled according to tracking service FlightAware.com.

The weekend tornadoes follow a series that hit just before the Christmas holiday which left at least 17 people dead.