VIDEO: Okla. Twister Caught on Cell Phone

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At least 51 people -- including seven children at an elementary school -- were killed when a massive tornado struck an area outside Oklahoma City on Monday afternoon, officials said.

The tornado was estimated to be at least 2 miles wide at one point as it moved through Moore, in the southern part of the Oklahoma City metropolitan area, KFOR reported.

Video showed a funnel cloud stretching from the sky to the ground, kicking up debris.

Check out some of that video above.

*Check out some incredible photos here*