Storm damage to buildings in Oklahoma
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Oklahoma hit by powerful storm

A powerful storm has swept across the US state of Oklahoma, downing power lines and causing extensive damage to property.

There were reports of a tornado in the city of Norman, Oklahoma, home to the national Storm Prediction Center.

National weather forecasters are predicting that conditions could get worse with strong tornadoes from Texas to Minnesota this weekend.

The warning issued on Friday also covers parts of Illinois, Iowa, Kansas, Missouri, and Nebraska.