Hillsborough investigators are considering whether charges will be brought against two more suspects.
The Crown Prosecution Service (CPS) said the suspects are from West Midlands Police, which investigated the aftermath of the disaster.
The Independent Office for Police Conduct (IOPC) is also reviewing evidence relating to three former South Yorkshire Police officers.
Ninety-six Liverpool fans died as a result of the crush on 15 April 1989.
The CPS said it expects to announce within the next three weeks whether charges will be brought against the two suspects from West Midlands Police.