The trial of two teenagers accused of killing two Polish men in a screwdriver attack in Drimnagh in 2008 will now not begin until 2 June 2010 – a delay of almost a year since the original court case was due to proceed.

Last month, the families of Pawel Kalite (29) and Marius Szwajkos (27) were flown to Ireland to attend the trial, which was due to begin in July, only to be left "distraught" when it was postponed.

The Central Criminal Court trial of the two youths accused of killing the two Polish men was adjourned until next term following an application by defence counsel.

Gardaí had hoped that the trial would proceed in October but were informed last week that a trial date of 2 June 2010 has been set – meaning the trial will proceed almost two-and-a-half years after Kalite and Szwajkos were killed.

Sean Keogh (19) of Vincent Street West, Inchicore, and David Curran (18) of no fixed abode, are accused of murdering the two men on Benbulben Road, Drimnagh, in February 2008.

Giollaíosa Ó Lideadha, defending Curran, told Justice Paul Carney that additional evidence had been recently served on the defence and certain tests had to be carried out on his client.

Members of the two men's families had been flown over to attend the trial and were present in court to hear that it would not proceed as planned.

"They were very upset but there was not a lot we could do," said a garda source.

Justice Paul Carney said he was reluctant to adjourn the case as the defendants had been returned for trial almost a year ago. But he said he could not force the trial to go on and acceded to the defence application to adjourn the trial.