Storm system caused havoc in USA
Several people were injured when a tornado battered western Nebraska in the USA on 20 April, destroying farms and cutting electricity supplies.
The tornado was spawned by a major system of thunderstorms which extended from Texas, through Kansas and into Nebraska.
More than 14 000 homes and businesses were left without power in areas of Texas.
Experts forecast that the storms will continue to cause problems this week, especially in Texas and Kansas, where hail could threaten the wheat crop.
