Rescue crews have been searching for victims of tornadoes that tore across five US states killing at least 55 people and injuring hundreds more.Dozens of twisters hit Tennessee, Arkansas, Kentucky, Alabama and Mississippi at the end of the Super Tuesday presidential nominating votes.
The storms upturned vehicles, damaged buildings, uprooted trees and left thousands of people without power.
President George W Bush has offered aid and will visit Tennessee on Friday.
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