More than 20 people including senior security force personnel and ex-IRA members may be considered for prosecution

The agent code named “Stakeknife” was one of British military intelligence’s most valued assets, operating inside the Provisional IRA. Recruited in the late 1970s, the spy rose through the IRA’s ranks in Belfast to become head of the paramilitary group’s informer-hunting unit known as “the nutting squad”. He had the power of life and death over IRA members accused of being informers for the security forces during the Troubles. His unit used torture methods to extract admissions from those in the IRA accused of treachery. Often their so-called “confessions” were taped and on occasion played to their close relatives to convince them that the victim had been “guilty” of treachery.