Taoiseach Micheál Martin laid a wreath at the Enniskillen Cenotaph to celebrate Remembrance Sunday.
It has been 35 years since 11 people were killed in an IRA bombing while attending the annual event.
A twelfth person died years later and never recovered from his injuries.
More than 60 people were also injured when a bomb was planted inside a community hall next to the cenotaph.
Relatives of the dead were among a crowd of several hundred who showed up for the brief service.
Mr. Martin has continued the tradition, started ten years ago, of attending the annual event.
Speaking after the service at Enniskillen, the Taoiseach said the bombing showed “absolute futility and immorality” of violence.
He said his presence at the Memorial Day event also reflected the spirit of the Good Friday Agreement, which was about seeking mutual understanding and reconciliation.
It is the first year that a permanent memorial for the victims has been established.
The names of the victims are engraved on a plaque placed on the wall of a peace center, which replaced the destroyed room where the bomb was placed.
The Enniskillen event was one of many in Northern Ireland to celebrate the deaths of two world wars.
The main commemoration in the Republic of Ireland was held at St Patrick’s Cathedral in Dublin.
President Michael D. Higgins attended the traditional Sunday service in remembrance of the Royal British Legion.
The event was also attended by Sinn Féin leader Mary Lou McDonald.
It remembered the 60,000 Irish men and women from all over the island who died in the conflicts.
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