Police notebooks may contain crucial Hillsborough evidence
11 September 2013 Last updated at 21:59 BST
The police watchdog is investigating the behaviour of police officers after the Hillsborough football stadium disaster and says it is working through new evidence.
The Independent Police Complaints Commission has recovered more than 90 police notebooks which could contain crucial new information.
Some of the families of the 96 Liverpool fans who died say new investigations into the disaster are moving "too slowly".
Judith Moritz reports.