CLEVELAND -- Surveillance video at a gas station has customers and police doing a double-take.

The video is from a Cleveland and shows a blue cloud hovering near the gas tanks. The image is almost ghost-like.

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VOTE: Is The Blue Cloud A Ghost?

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The cloud stays there for half an hour, and then it floats away. A little while later, it comes back and stays on top of a car's windshield.

Store owner Amed Abudaaria said, "I watched it for half an hour. And then actually I see it move. And that's really when I got freaked out."

Abudaaria has not been able to determine what the blue cloud is. But to add to the mystery, neighbors said the gas station is on the former site of an Indian burial ground.