A man whose wife was killed in the Omagh bombing three years ago has criticised the RUC and Garda for their lack of progress in the investigation.
Only one person has been charged in connection with the attack, which left 29 people and two unborn children dead and injured hundreds more.
Yesterday, the third anniversary of the bombing, Mr Laurence Rush interrupted a joint RUC/Garda press conference as senior officers appealed for anyone with information to come forward.
Mr Rush, whose wife Libbi died, said: "In Great Britain they can pick up lone murderers out of a population of 59 million." He asked the two officers giving the press conference, RUC Chief Supt James Baxter and Garda Det Supt Tadgh Foley, if they recognised they were dealing with a population of four million.
Mr Rush also raised questions about the confinement of troops to barracks on the day it happened, and recent newspaper articles suggesting intelligence reports warned of a bomb attack that day.
"I will cry for my wife today again, and by the look of the rate the RUC and the Garda Siochana are going, I will be crying for many, many years," he said.
Supt Foley said both forces had strong suspicions about those responsible but needed more information. "There are people who have information, and I know they have information, but we cannot police without public support," he said.
Asked if those who had information were withholding it out of principle or because they had been intimidated, he said: "I would think they are afraid to come forward but I am asking them now to have the courage to come forward."
Mr Michael Gallagher, whose son Aidan died in the blast, said the families would continue to put pressure on the British and Irish governments over the investigation and warned it was only a matter of time before there was a repeat of the bombing.
"We as a society have to ask ourselves, has the effectiveness of the law become so blunted that these people can circumnavigate it," he said. "We have seen the atrocity in Omagh, they say they are sorry for what they have done and yet they have continued to carry on bombing here in Northern Ireland and on the mainland.
"Just over a week ago, but for the grace of God, we could have had another terrible atrocity," he said. "I feel that it is only a matter of time before these people do kill again."
Mr Gallagher said he felt the "key to this investigation lies within the republican community and I would appeal to the decent people in that community to have the courage to come forward.
"We have often seen the leadership of the republican community come out and demand justice and I would feel that Omagh should not be singled out from any other atrocity and that we should get the same attention."