Four organisations - including South Yorkshire Police and Sheffield Wednesday football club - are being investigated for possible criminal culpability over the Hillsborough disaster.
Sheffield City Council and the Football Association are also being investigated for possible gross negligence manslaughter. The senior detective leading an investigation into the tragedy, in which 96 Liverpool fans died in 1989, said it was exploring all liability, both public and individual.
More than 90 police notebooks that could contain crucial information about the Hillsborough disaster have been recovered. They've been handed into South Yorkshire Police by retired and serving officers.
The force is the subject of the biggest ever inquiry into police conduct in the UK. The IPCC says it's already found evidence to suggest statements about the tragedy may have been changed.