Relatives of those who died in the Omagh bombing are to pursue the killers through the international courts.

The Omagh Support and Self-Help Group believes the explosion breached international law and the Geneva Convention.

The group believes the fact that victims came from four different countries adds weight to their claim.

They believe the international forum could help republicans give evidence.

The decision comes as the family of one of the victims has decided to rebury their son in England.

'We can't get justice'

Twentynine people were killed when the Real IRA bomb ripped through the County Tyrone town on 15 August 1998.

Michael Gallagher: international forum is the best

Speaking on BBC Radio Ulster on Monday, Michael Gallagher, whose son Aidan was killed in the bomb, said: "The republican movement refused to co-operate and those people hold the key to solving this mystery.

"Because they have difficulty in working with the RUC and Gardai, we can't get justice.

"There's no reason why we should be denied justice in any other forum and the international forum is the best."

The Omagh support group claims the bomb breached Article 57 of the Geneva Convention, that "care shall be taken to spare the civilian population, civilians and civilian objects".

'Look to the future'

Victor Barker, the father of 12-year-old victim James Barker, said the republican movement must help catch the murderers.

"If Mr Adams and Mr McGuinness really are men of peace, why can't they come forward and ensure that information is given to bring these people to justice?

"It is a very simple thing to do.

"They always go back to history, history, history.

"I think it's time Mr Adams and Mr McGuinness put history behind them and started looking forward to the future."

New grave for young victim

The Barker family has announced plans to rebury their son, James.

His remains will be dug up on Good Friday and reinterred near the family's new home in the south of England.

The family had moved from England to County Donegal in the Republic of Ireland three years ago.

James Barker: Bomb victim

They had moved to the seaside town of Buncrana, with the intention of raising their four children in the peace of rural County Donegal.

James was on a trip to Omagh with a group of friends when the Real IRA bomb ripped through the County Tyrone town.

Victor Barker said: "It was a very difficult decision, but I think it's a very personal one.

"I think it's the best thing for every member of my family."

Worst single atrocity

Hundreds more were injured in the explosion which took place on a busy shopping day.

The Omagh bombing took place four months after the signing of the Good Friday Agreement.

Two baby girls, five other children, 14 women and five men were among the victims.

The bomb was the worst single atrocity in the history of Northern Ireland's Troubles.

The Real IRA called a ceasefire shortly after the attack, which was widely condemned on both sides of the political divide.