Abusive changes to the Wikipedia page on the Hillsborough disaster were made from a computer in Whitehall, it has emerged.
The Cabinet Office has launched an investigation into a string of changes, all of which were designed to mock the disaster.
In 2009, "blame Liverpool fans" was added to the page. In 2012, the phrase "you'll never walk alone" was changed to "you'll never walk again".
"This is a matter that we will treat with the utmost seriousness and are making urgent inquiries," a Cabinet Office spokesperson said.
"No one should be in any doubt of the government's position regarding the Hillsborough disaster and its support for the families of the 96 victims and all those affected by the tragedy."
The Liverpool Echo found the changes were made from a variety of IP addresses from computers in government departments, including the Department of Culture, Media and Sport, the Treasury and the soliciter general's office.
"I don't even know how to react, it's just so sad," Margaret Aspinall, of the Hillsborough Family Support Group, told the newspaper.
"I hear something like that and it upsets me a great deal, it makes me incredibly sad. I'm glad somebody has found out about it but I'm frightened, to be honest, that we haven't known until now."
One description of a Bill Shankly statue was changed from "he made the people happy" to "he made a wonderful lemon drizzle cake".
Another changed the phrase "this is Anfield" above the player's tunnel to "this is a shit hole".