Edits made to the Hillsborough disaster page on Wikipedia have been described as an "absolute insult to victims and their families".
Margaret Aspinall, mother of one of the victims said: "It's an absolute insult to the families who are fighting for where we are today and it has to be investigated".
Sheila Coleman from the Hillsborough Justice Campaign added that the distress was compounded by the timing of the revelations.
"That this happens now when the families are immersed in the inquest procedure goes to the heart of why should they trust the establishment," she said.
More top news
Alex Salmond found himself in a stand-off with airline staff after booking on to a flight under the name James Kirk.
Romelu Lukaku equalised to ensure Everton earned a point after Danny Ings had given Liverpool the lead in a heated derby clash.
Postman suspended as part of probe as hundreds of letters from a Black Country delivery office took two and a half years to arrive.