Tornadoes and floods cause death and devastation in the US

At least 11 people died and dozens were injured in tornadoes that swept through the Dallas area and caused substantial damage while six people have died in flooding in the US mid-west.

It was the latest in a succession of powerful weather events across the country - from heavy snow in New Mexico, west Texas and the Oklahoma Panhandle - to flash flooding in parts of the plains and mid-west.