A Dublin inquiry into alleged Garda collusion with the IRA in the murder of two senior RUC officers is expected to seek a third extension.
Sources said the chairman of the Smithwick Tribunal will have no choice but to apply to the Irish government for more time to deal with “explosive” new evidence.
The PSNI produced never-before-seen evidence last Wednesday, as the probe into the IRA killing of Chief Superintendent Harry Breen and Superintendent Bob Buchanan in Dundalk in 1989 entered its final stages.
The five documents included claims an officer told colleagues he was worried three men were sharing information with the IRA. The inquiry, chaired by Judge Peter Smithwick, has focused on former garda officers Owen Corrigan, Leo Colton and Finbarr Hickey, who deny passing information.
After the new material emerged, the Buchanan family called for a new cross-border investigation into the murders.
They claimed the new evidence pointed to collusion between some gardai and the IRA. They also criticised the PSNI for withholding the information.
Judge Smithwick earlier adjourned the tribunal until the end of August.