A self-acknowledged IRA bombmaker has offered to take a lie detector test to confirm that he was not involved in the Omagh bombing nor that he got information from a garda in Dundalk.

Patrick Joseph Blair, known as 'Mooch' Blair, also dismissed as pure coincidence a 59-second phone call he received from members of the Real IRA on the day they planted the Omagh bomb.

As he left the tribunal, Mr Blair was confronted by a woman whose father was killed in an IRA bomb.

Mr Blair did not respond to her or to comments by a supporter with her but simply smiled.

Earlier, during his cross-examination this afternoon by Michael Durack, senior counsel for the Garda Commissioner, he was asked about his allegiances when the Real IRA split from the Provisional IRA. "I am not on trial here," he answered.

He again denied that he was a member of the IRA's internal security unit.

The tribunal is investigating whether a garda in Dundalk passed information to the IRA that allowed them to set up an ambush and kill two senior RUC officers.

Chief Supt Harry Breen and Supt Bob Buchanan died minutes after leaving a meeting in the station on 20 March 1989.

Mr Blair said he was aware of the two men as they had given interviews on television and appeared in newspapers.

In response to questions by Jim O'Callaghan, counsel for former Det Sgt Owen Corrigan, one of the former gardaí being investigated, Mr Blair denied that he ever met him or got information from him.

He said Det Sgt Corrigan "very definitely" had anti-republican feelings and he again dismissed claims by a British agent, known as Kevin Fulton, that Mr Corrigan passed information on to the IRA.

Under cross-examination by counsel for Mr Fulton, it was put to Mr Blair that he was, in the word of a senior RUC officer, "a central figure in the command structure of the IRA in Dundalk and Newry" to which he replied "that is his opinion".

He also denied that he had supported and "green-booked" the British agent into the IRA.

Asked if he phoned RUC stations to gloat after an officer had been killed, Mr Blair replied there were 'psych-ops' on both sides.

He also acknowledged that he would not betray anyone who was a member of the republican or who helped them.