Scotland Yard will remain silent over claims that undercover officers spied on Hillsborough campaigners "to protect national security and undercover police tactics", the force has said.
It refused a Freedom of Information request by the magazine Private Eye for files on the Hillsborough Justice Campaign and the Hillsborough Family Support Group amid claims the campaigners were put under surveillance.
The force has a policy to neither confirm nor deny what police moles have been up to, in a bid to protect officers who work undercover.
Scotland Yard said the Private Eye request was refused to protect tactics.
The "neither confirm nor deny" approach prompted anger among bereaved parents trying to discover whether their dead children's names had been used by undercover officers.
Last summer Jules Carey, solicitor for Barbara Shaw who believes that her son Rod Richardson's name was used, said she felt her complaint to Scotland Yard had been "swept under the carpet".
A report found that the names of 42 dead children were used by officers trying to create watertight false identities.
The lawyer acting on behalf of the families of those who died in the Hillsborough disaster has called for the inquest to be televised.
Speaking at a pre inquest hearing in London today, Michael Mansfield QC, urged the coroner, Lord Justice Goldring, to allow the proceedings to be shown to the public.
The families also heard around three thousand images of the disaster have been prepared, and pathology evidence will assess the time of death for each of the ninety six victims. The full hearing should start before the end of March next year.
A barrister has told a pre-inquest hearing that handheld footage filmed by police at Hillsborough may have been edited.
Pete Weatherby QC, who is representing 21 victims' families, asked for an audiovisual expert to be among those to give evidence to the inquest to ensure that the best possible copies were shown to the jury.
The Hillsborough Preliminary hearing has revealed more police statements from the stadium disaster had been changed than previously thought.
The Independent Police Complaints Commission investigation show 238 police statements have been altered, originally it was thought to have been 164.
220 of those officers are still alive. 132 of those officers have been invited for interview.
Lord Justice Goldring says he "remains committed" to a start date of March 2014 for Hillsborough inquests
The families of Hillsbrough victims have unfurled a banner outside the preliminary hearing in London in honour of Anne Williams.
The campaigner who died in April fought for justice for her 15 year old son Kevin who killed at the disaster.
The other side shows Sir Norman Bettison who is under investigation over claims he was behind a police cover-up.
Barry Devonside arrives at the Hillsborough preliminary inquest hearing in London.
His 18-year-old son Christopher was one of the 96 Liverpool fans to die in the disaster.
Families of ninety-six people killed in the Hillsborough disaster will today attend the final preliminary hearing ahead of fresh inquests next year. It's after the 1991 verdicts of accidental death were quashed by the High Court.
More than 90 police notebooks that could contain crucial information about the Hillsborough disaster have been recovered. They've been handed into South Yorkshire Police by retired and serving officers.
The force is the subject of the biggest ever inquiry into police conduct in the UK. The IPCC says it's already found evidence to suggest statements about the tragedy may have been changed.
South Yorkshire police has been ordered to search all it's storerooms for notebooks which could provide crucial evidence of what happened on the day of the Hillsborough disaster which claimed 96 lives.
The Independent police complaints commission has revealed that one officer has admitted keeping a note of what happened in his pocketbook which was contrary to what he'd been told to do. The watchdog says it could be a significant new piece of evidence.
No notebooks have ever been looked at by any Hillsborough inquiry and the South Yorkshire force has been told to make a rigorous search of it's archives.