Several hundred people have attended a remembrance service in Omagh, Co Tyrone, to mark the 20th anniversary of the bombing in which 29 people died.
Relatives of those killed in the explosion and survivors of the attack attended an inter-denominational service at The Memorial Garden in Omagh today.
A car bomb ripped through Omagh on 15 August 1998 killing 29 people, including a woman who was pregnant with twins, and leaving more than 200 others injured.
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The victims came from Northern Ireland, the Republic of Ireland, England and Spain.
A republican splinter group, which called itself the Real IRA, said it carried out the attack.
No one has ever been convicted of involvement in the bombing.
Representatives of the Irish, British and Spanish governments attended the service today.
The Irish Government was represented by Minister for Health Simon Harris.
He said the Irish Government remained determined to bring those responsible for the attack to justice.
The Chief Constable of the PSNI George Hamilton, who also attended the service, said the investigation into the Omagh bomb remained open but he says that if no new evidence was forthcoming the chances of securing convictions remained slim.
Michael Gallagher, whose 21-year-old son Aiden died in the bombing, said today's service would be the last one of this kind.
He said that after 20 years it was time to bring it to a close.
The Omagh Community Youth Choir performed a piece of music at the event composed specially by its musical director Daryl Simpson.
The choir included Cara McGillion, 17, the daughter of Donna Marie and Garry who were left seriously injured in the attack.
Local singer Leslie Matthews and St Eugene's band also performed.
On Wednesday, a public reflective event will take place at 2.55pm to mark the moment the bomb exploded.
A bell will be rung 32 times to reflect the 31 lives lost, with an additional ring to remember all those who have lost and continue to lose their lives through such atrocities across the world.
The bell will stop ringing at precisely 3.10pm to mark the exact moment of the explosion.
Additional reporting: PA