The police watchdog has revealed that statements of 74 more officers at the Hillsborough stadium disaster "may have been amended."
After the incident in 1989, West Midlands Police was called in to investigate South Yorkshire Police.
The Independent Police Complaints Commission made the revelation as it provided an update on the setting up of its inquiry into the tragedy:
"We have uncovered material which would suggest that fans’ witness accounts may have been altered.
We have recovered pocket notebooks from officers who were on duty on the day of the match.
We are in the process of interviewing all the surviving officers whose accounts were amended."
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