A 13-year-old girl was one of two teens found dead on top of a Brooklyn train overnight in what investigators believe may have been a fatal subway surfing incident, police sources said Saturday.

Cops were called at 3:10 a.m. to the Marcy Avenue-Broadway subway station in Williamsburg, where they found the girls unconscious and unresponsive on the Brooklyn-bound J train, the sources said.

The victims were pronounced dead at the scene. The second victim is believed to be between 13-and 18-years-old, sources said.

Officers were seen speaking to three teen boys inside the station, then driving two of the boys away in a cruiser. 3

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No arrests have been made and no criminality is suspected, police said.

Cops and firemen were also seen carrying a plastic bag and skateboard out of the

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