A Garda spokesperson says the force won't be commenting further on the issue – but confirmed an investigation into the leak is underway.
TD Paul Murphy says he finds it incredible that the media knew about plans to charge people in relation to the 2014 incident before those expected to be charged.
He's lodged complaints with the Garda Commissioner, GSOC and the DPP on the matter.
The Tánaiste is expected to be called to give evidence if the issue goes to trial.
