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Last Updated: Monday June 07 2010 14:57 GMT

Tornado damage in the USA

American flag near a damaged house in Lake Township in Ohio

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Extreme weather has been causing massive problems in parts of Midwest America.

Tornadoes and thunderstorms have killed seven people and destroyed at least 50 houses in the state of Ohio.

The high school in the town of Lake Township was among the hardest-hit buildings.

The extreme weather also affected parts of Illinois and Michigan.