Parliament looks likely to be asked to debate the Government's decision to seek to block the publication of files detailing Margaret Thatcher's cabinet discussions on the Hillsborough stadium disaster after an online petition campaign.
Last night more than 92,000 people had signed up opposing a decision to appeal the release of documents into the 1989 tragedy in which 96 Liverpool fans died.
The Hillsborough Justice Campaign (HJC) requires 100,000 backers on the 10 Downing Street website before the matter is referred to the House of Commons Backbench Business Committee.
HJC chairman Kenny Derbyshire said: "We have been truly amazed at the level of commitment and support these past few days."
The Hillsborough petition is the second most supported on the site. More than 200,000 signed a call for convicted rioters to lose their benefits. The petition follows a ruling that the papers should be made public.
The Cabinet Office has said it will appeal against the decision to let the Hillsborough Independent Panel oversee the disclosure of documents.