Niall Ganley, from The Priory, Grange Road, Rathfarnham, Dublin pictured at the Criminal Courts of Justice (CCJ). Photo: IrishPhotoDesk.ie

Niall Ganley, from The Priory, Grange Road, Rathfarnham, Dublin pictured at the Criminal Courts of Justice (CCJ). Photo: IrishPhotoDesk.ie

A school teacher who had highly sexualised conversations online with teenage girls has been jailed for two and a half years.

Dublin man Niall Ganley (33) was caught as a result of a sting operation by a UK based vigilante group set up to stop sexual grooming of children online.