The trial of four gardaí accused of assault has collapsed at Dublin Circuit Criminal Court.

Gardaí Sean O'Leary, Eoin Murtagh, Alan Conlon and Claire Delaney were charged with assault causing harm and trespass.

They had denied entering a flat at Basin Street Upper and assaulting Owen Gaffney on 17 February 2008.

Mr Murtagh, Mr Conlon and Ms Delaney were also charged with falsely imprisoning Mr Gaffney's mother by locking her in a bathroom while the alleged assault took place.

The jury was discharged by Judge Desmond Hogan on the grounds that certain matters had come to light from the prosecution and ombudsman office.

The judge said that what had been disclosed was a serious matter and needed to be examined.

The case has been put back to 10 November for a date to be set for a retrial.