The police watchdog is appealing for witnesses as part of its investigation into how West Midlands Police conducted its inquiries into the Hillsborough disaster.
Deborah Glass, deputy chair of the Independent Police Complaints Commission, said: "We have already had a number of people contact us with concerns that their statements were amended and we have no doubt there are others who have not contacted us.
"We want to be able to present as full as possible a picture of witness evidence both for the inquests and the criminal investigations."
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