The families of people killed on Bloody Sunday in Derry have expressed concern that the release of the Saville report, due next month, could become a total debacle.
They criticised the Northern Secretary for failing to let them know when they would receive the report.
It is due to be delivered to Shaun Woodward in the week beginning 22 March, but the relatives may have to wait at least another fortnight.
They fear it could be amended or have parts withheld by British government agencies.
Thirteen people died after British soldiers opened fire during a civil rights march in Derry in January 1972. Another person died later.
John Kelly, whose brother Michael was killed on Bloody Sunday, said the families feared the report would fall victim to selective leakage and other partisan usage long before the full report saw the light of day.
He said the inquiry process, detailed, meticulous and painful as it was, could become a total mess and travesty in the final few weeks before it becomes public.
The families met a representative of the Department of Foreign Affairs at the weekend and also sent a letter to Lord Saville strongly urging him to follow established precedent by taking full responsibility for providing the report to all interested parties at the same time.
They also wrote to Shaun Woodward demanding that he assent to Lord Saville taking full responsibility for the publication of the report.
The families called on Lord Saville to set the truth free and on Shaun Woodward to agree that Lord Saville should set the truth free.
They called on Deputy First Minister Martin McGuinness, Foyle MP Mark Durkan, Derry Mayor Paul Flemingy, as well as MLAs, to act now to prevent the Saville report from becoming a total debacle and to assist in setting the truth free.
Deputy First Minister Martin McGuinness of Sinn Féin said he shared the concerns of the families.
He said he believed consideration of the families' legitimate requests should take primacy over any consideration of the British government or its paratroopers who were responsible for the killings.
He said the families and their legal representatives should have sight of the report in full.
‘For the report to be in possession of the British government 14 days is an attempt to give unfair advantage to the British government over the families and is unacceptable. This can only give rise to suspicions of interference and attempts to portray the actions of the British government of the day and its armed forces in the best possible light. This is contrary to natural justice. Openness and transparency is paramount. There should be no proofing or editing of the report before the families have sight of it - only full disclosure of the findings of the Inquiry is acceptable’, Mr McGuinness said.
Foyle MP Mark Durkan of the SDLP said the families deserved clarity.
'We can do without interference and manipulation or the suspicion of manipulation by forces within the government order and that's what the families are left with here. Shaun Woodward knew what the issues were, he has mishandled this in recent months unfortunately and the families have been left with no choice but to make the statements here today.'
In a statement, an Northern Ireland Office spokesperson said they wanted the report to be published as quickly as possible.
The spokesperson said the Secretary of State had met the families on several occasions, and understood their concerns.
He said Mr Woodward would continue to make every effort to ensure that publication is fair to everyone involved.
'However the government must also respect its obligations to Parliament in relation to this public inquiry. Once we are in a position to outline publication arrangements we will be in touch with the families', the NIO spokesperson added.
