The tribunal is investigating allegations of Garda collusion in the murders of two senior RUC officers.
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Investigations into the bombing have been carried out by the RUC, along with the Garda Siochana.
Roger Sofer and Kevin Latta came from Texas, Hank Garda from his New Jersey home.
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The Republic of Ireland's most senior police officer, Garda Commissioner Martin Callinan, also expressed his condolences.
Det Garda Adrian Donohoe was killed at Lordship Credit Union at Bellurgan on 25 January 2013.
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Det Garda Donohoe was one of two detectives on escort duty when the robbery happened.
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He added that the allegation was also a slur on the Irish police, the garda.
Also at the ceremony were the Catholic Primate Archbishop Sean Brady, the Garda Commissioner Pat Byrne and RUC widows.
The developer was taken to a Garda station where he was given tea, biscuits and curry chips.
The tribunal, is investigating allegations of Garda collusion in the 1989 murders of two senior RUC officers.
The builder was ultimately acquitted after two garda detectives were alleged to have forged notes and committed perjury.
Ch Supt Breen and Supt Buchanan were killed only minutes after leaving a meeting in Dundalk Garda Station.
The Dublin-based tribunal is investigating allegations of Garda collusion in the IRA murders of two senior RUC officers.
The Garda, whose members wear black uniforms emblazoned with nationalist insignia, is organised by the far right Jobbik party.
Detective Garda Adrian Donohoe, 41, was shot dead during a robbery at a credit union in Bellurgan, near Dundalk.
Its new bugbear is the Magyar Garda (Hungarian Guard), a self-styled civil-defence group.
Yet Jewish and Roma (gypsy) groups have called for action against the Garda.
Garda sources point out that most people who use drugs do so for recreational reasons and are not addicted.
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Sinn Fein leader Gerry Adams has apologised for the IRA killing of Detective Garda Jerry McCabe 17 years ago.
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Detective Garda Adrian Donohoe, 41, was killed at Lordship Credit Union in Bellurgan at about 21:30 GMT on Friday.
On Friday Garda Adrian Donohoe was shot dead during a robbery of a credit union in Bellurgan, County Louth.
Another garda points to the significance of the diminishing value of individual hauls.
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They were taken to separate garda stations in Clonmel and Cahir for questioning.
The investigation is being led by the Police Service of Northern Ireland (PSNI) and supported by the Garda Siochana.
Fidesz's initial response was to defend the Garda's right of free association, and accuse Mr Gyurcsany of whipping up hysteria.
The day after the murders, Ned O'Dea, then the assistant Garda commissioner, was sent to Dundalk to conduct an enquiry.
She thought so again while she watched from her dining-room window a garda car arriving, and an ambulance soon after that.
The girl who had come forward was detained for several hours at the Garda station from which inquiries were being made.
But in 2011 a local organisation that responds to emergencies on the lake, the Garda Volunteer Group, took up the hunt.
The Smithwick Tribunal has been told of "rumours" in the mid-1980s that a Garda detective sergeant had inappropriate associations with subversives.
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