There could be more Irish arrests on the way - as part of a global crack-down on child porn.
Two men were questioned earlier this year after a Canadian led investigation supplied a list of 80 names to gardai here as part of an investigation named Project Spade.
They say adults - including some parents - were paying for videos and images of naked children from Eastern Europe and in particular Ukraine and Romania.
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Two men arrested here in Ireland were questioned then released without charge, with a file on the way to the DPP.
Mike Berry is a Clinical Forensic Psychologist working with the Irish authorities - he told Newstalk's Pat Kenny show it's very difficult to get evidence against the ring leaders:
