DENVER (CBS4) –  Smoke in the south TSA lanes at Denver International Airport caused trains to stop running, as a precaution. They’ve since resumed operations.

DIA officials say there is no current emergency, and the north and A TSA checkpoints are open, but the south TSA checkpoint is closed for investigation.

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Denver firefighters are on scene investigating, although it’s not clear if the fire is out.

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LINK: Denver International Airport