The heartbroken families of many of those who died in the Omagh bombing in 1998 will gather in the town this afternoon for a prayer service to mark the 25th anniversary of the attack.
The bombing by dissident republican group the Real IRA which killed 29 people was the largest single atrocity of the Troubles.
The dead included a woman who was seven months pregnant with twins while hundreds more were injured.
The victims included a Spanish child on a school exchange trip and three young boys from Buncrana – Sean McLoughlin, 12, Oran Doherty, 8 and James Barker, 12.
No one has ever been convicted in connection with the attack.
The explosion happened just four months after the Good Friday Agreement was signed, and was heralded as signalling the end of the Troubles.
The service today will take place in a memorial garden just 200 metres from the scene of the explosion.
It features 31 poles with a mirror at the top of each in memory of all the lives lost that day.
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