The father of one of the victims of the 1998 Omagh bomb attack has hit out amid reports of an imminent collapse of the prosecution of a man accused of the murders.
Michael Gallagher, whose son Aiden was among 29 people to be killed in the Real IRA bombing, expressed outrage that families have been kept in the dark.
The case against 45-year-old County Armagh bricklayer Seamus Daly - who denies involvement in the bombing - will be mentioned at a court in Ballymena later this morning.
Court proceedings are currently subject to reporting restrictions.
Mr Gallagher said he was unhappy that information was circulating about the collapse of the case while the families had not been notified.
"We have been failed once again by the police service, by the prosecution service, by the government and by the criminal justice system," he said.
A man has been arrested by police investigating the Omagh bomb. The Real IRA blast in 1998 killed 29 people and a woman pregnant with twins.
The suspect was detained in Newry, Co Down.
Michael Gallagher, whose son Aiden, 21, was among the Omagh victims, condemned the decision, describing the reasons given by Ms Villiers for ruling out a public inquiry as "trivial".
He told Sky News: "Should we be denied truth and justice because other people don't want it?"
Referring to his belief that the bomb attack could have been prevented, he said: "The reality is that Aiden need not have died."
He added: "Both the British and Irish governments failed to protect the human rights of those people."
And he said that victims' families would be mounting a legal challenge to the decision by Ms Villiers.
Explaining the decision to reject calls for a public inquiry into the 1998 Omagh bombing, Northern Ireland Secretary Theresa Villiers said in a statement:
The Government will not launch a public inquiry into the events surrounding the Omagh bombing in 1998, it was announced today.
"After consultation and careful consideration, I have decided not to instigate a public inquiry into the circumstances surrounding the bombing in Omagh on 15 August 1998," Secretary of State for Northern Ireland Theresa Villiers said.
"The current investigation by the Office of the Police Ombudsman for Northern Ireland is the best way to address any outstanding issues relating to the police investigation of the Omagh attack."
The car bomb was an attempt to disrupt the peace process, killing 29 and injuring more than 200.
No criminal convictions have been made in connection with the attack.
Republicans Colm Murphy and Seamus Daly have been found liable for the Omagh bombing following a landmark civil action taken by relatives of some of the victims at Belfast High Court.