MEXICO CITY -- Authorities in Mexico's Gulf coast state of Campeche have launched an investigation into a porn video made inside a classroom by sixth-graders at a local school.

State Education Department spokesman Omar Kantun Kantun says the video was apparently made in an empty classroom during recess in late April.

The video shows three boys having oral and anal sex. It was apparently made with a cell phone.

The mother of one of the boys saw the video on the internet and notified authorities this week. The video has been taken down.

Kantun Kantun said Wednesday the teacher who uses the classroom does not appear to have been present when the video was made.

He said an investigation has been launched but no disciplinary action has been taken.