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Six of the Worst Twisters in US History

Fire burns in the aftermath of a deadly tornado in Moore, Oklahoma.

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The Worst Twisters

The full extent of the destruction caused by the enormous tornado that ripped through Oklahoma was still being determined on Tuesday. At least two dozen people were killed. Entire blocks of homes were flattened. At one hospital alone 85 patients, including 65 children, were being treated for injuries. And many were still missing. Here's a look at how this horrific storm, pictured here, compares to some of the deadliest tornadoes in U.S. history.

- By Andrew Rafferty, Staff Writer, NBC News

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