The relatives of those who were killed in the 1985 Air India disaster have renewed their appeal to the Canadian government for a public inquiry into the bombing which took 329 lives.
Around 300 relatives were among about 1,000 people who attended ceremonies in west Cork to mark the 20th anniversary of the atrocity.
For the first time the Canadian Prime Minister, Paul Martin, laid a wreath at the monument at Ahakista, as did President Mary McAleese who called the bombing 'a wicked and evil event'.
Mr Martin said that 23 June would forever be marked as a national day of remembrance for all victims of terrorism, and that a national monument to honour the dead would be built on Canadian soil.
Government ministers from India and Canada, as well as members of Ireland's emergency services who took part in the recovery operation, attended this morning's service.
The Air India plane, flying from Toronto via London to Bombay, blew up just 45 minutes before it was due to land at Heathrow.
After an 18-year investigation and a two-year trial, the Supreme Court in Vancouver acquitted two men charged with the bombing, three months ago.
A third man is serving a five-year sentence for manslaughter.
Last month, the Canadian government paid a subsidy of $2,500 per person for up to two relatives of the victims to attend the ceremony.
