Parents of pupils at Brownlow College have been warned to be on their guard after a number of children at the school received inappropriate messages from a male adult.
It would appear the man has been contacting female pupils at the Craigavon school via Facebook.
Local Councillor Declan McAlinden said: “Check with your kids and report to PSNI if they have been contacted by this person.”
The school recently sent a letter to parents warning them of the incidents.
No spokesman for the school was avaialble when contacted.