The Penn Yan and Dundee School Districts are warning parents about an online threat. Police say seven students in Yates County have come forward with reports about an online predator. The students described someone on social media claiming they have nude pictures of them and demanding more. According to Penn Yan Police Chief Thomas Dunham the person is blackmailing the students threatening to release more images. "It's very disturbing, It's disturbing behavior," said Chief Dunham. Dunham says his Department is working closely with state police and school resource officers to find the person responsible. Investigators are tracking IP addresses to determine where it is coming from.