WATCH: Tornado tears roof off Iowa school with 100 people inside

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More than 100 people were inside South Central Calhoun High School in Lake City, Iowa, on Sunday when a tornado struck, tearing off the building's roof, WHO-TV reports.

The shocking scene was captured on video by resident Tim Klatt.

>> Mobile users: Click here to watch the video

Those in the school sought shelter in the basement. No injuries were reported.

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"The lights went off, and everyone's ears kind of popped," Dave Birks, a coach at the school, told the Des Moines Register. "They say a tornado sounds like a freight train, and that lasted only 5 or 10 seconds."