Crews searched today for more victims of deadly tornadoes that killed at least 52 people and injured hundreds more as they tore across four US states, ripping off a shopping mall roof, demolishing mobile homes and blowing apart warehouses.

Crews searched today for more victims of deadly tornadoes that killed at least 48 people and injured hundreds more in the US.

A massive fire erupted at a petrol station in Tennessee, spreading to houses and killing several people, authorities said.

The FBI is investigating allegations of theft and other wrongdoing by American Red Cross volunteers who distributed relief supplies after Hurricane Katrina.