MASTIC BEACH - A Mastic Beach sex offender is under arrest after he allegedly filmed models undressing at a fashion show in Southampton.

Police say 51-year-old Robert Liguori was hired to photograph a fashion show two months ago and placed a hidden camera in the changing room. Officials say the women were between 20 and 30 years old.

According to investigators, the camera was discovered by one of the women, who reported it and spurred the investigation that eventually led to Liguori's arrest.

Liguori had previously been convicted of distributing child pornography in 2000 and was arrested on a stalking charge two weeks ago.

Liguori is facing four counts of unlawful surveillance and three counts of attempted surveillance in connection with the filming incident.