(SANFRANCISCO.CBSLOCAL) — Bay Area Rapid Transit police are investigating an amateur pornographic video apparently shot on a moving train.

Deputy Chief Ben Fairow said the cell phone video shows a “partially disrobed” couple having intercourse on a seat at the end of a BART train car.

The video was apparently filmed by a third party, and the man and woman in the video appear to know that someone is filming them. Fairow said the video does not show whether other riders are in the car.

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