
The UK's domestic spy service MI5 knew that a British double agent in the Irish Republican Army (IRA) had committed murders and then tried to hinder a police investigation and "conceal the truth", an official report found on Tuesday.
The nine-year £40 million (€46 million) probe — known as Operation Kenova — investigated actions of "Stakeknife", a senior IRA member who was passing information to British intelligence during the conflict in Northern Ireland known as the Troubles.