More than 90 police pocket notebooks that could contain crucial new information about the Hillsborough disaster have been recovered by investigators.
The Independent Police Complaints Commission (IPCC), which revealed last month that it was looking for the notebooks, said that 90 had been handed to South Yorkshire Police by retired and serving officers.
The force has also found boxes of notebooks and other documents that cover the period of the disaster, which could contain vital details.
Deputy chairwoman of the IPCC Deborah Glass said: "This is an ongoing criminal investigation the like of which has never been seen before in this country. Already we are uncovering more about the disaster and its aftermath.
"Hillsborough has had a history of inquiries by the police and others, many completed quickly, coming to flawed conclusions. Our investigations need to deliver the last, definitive account."
Last month, the IPCC revealed that at least one officer made a note of what happened that day, against instructions, and that none of the previous inquiries into the tragedy had recovered any such notebooks.
The disaster, which claimed the lives of 96 Liverpool fans in 1989, is now at the centre of the biggest ever inquiry into police conduct in the UK.
The IPCC said it had uncovered evidence to suggest that the statements of 74 more officers might have been changed, and that fans' witness accounts could also have been altered.
Investigators are set to appeal for witnesses next week in relation to how West Midlands Police ran their inquiry into the handling of the disaster by South Yorkshire Police.
Around 12,000 people spoke to West Midlands Police as part of their inquiry. Ms Glass said: "This appeal, which will be launched next week, forms a crucial element to our investigation into how West Midlands Police conducted its inquiries into the disaster. We want to hear people's experiences of that process."
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