The Dupont Circle Metro station is seen in this file photo. (Astrid Riecken/For The Washington Post)

Metro Transit Police said they are investigating a report of women being secretly videotaped on the rail system after videos turned up on a pornographic Web site.

The videos show women, typically wearing shorts or skirts, who don’t appear to be aware that they’re being filmed.

In an e-mail on Tuesday, Metro spokeswoman Caroline Laurin wrote that the agency finds the videos “disturbing” and that transit detectives are “aware of the matter and are investigating.”

She said riders should report any harassment or unusual behavior to transit police, “even if the incident may not rise to the level of a crime.”

The report first appeared on PoPville, a blog about D.C. neighborhoods.

(Related: Some creep is prowling the D.C. Metro filming women for a porn site, and there’s nothing you can do about it)

In October, a D.C. Superior Court judge dropped charges of attempted voyeurism against a Springfield man after he was accused of taking photos of women’s “private areas” at the Lincoln Memorial.

Christopher Hunt Cleveland was arrested in June 2013 after officers with the U.S. Park Police saw him snapping photos of women sitting on the steps of the memorial. An officer suspected him of taking “upskirt” shots.

The judge in that case said women did not have a reasonable expectation of privacy in such a public place and that they had positioned themselves in ways that made their intimate areas visible to any other passerby.

Staff writers Justin Jouvenal and Miles Parks contributed to this report.