Spy against police In the murky world of agent-running during the Northern Ireland conflict, there is nothing new about frayed relationships between MI5 and criminal investigations. Obfuscation ...

A battered leather briefcase left behind by Guy Burgess when he fled to Moscow in 1951 is among 20 objects from MI5's archives to go on display for the first time from Saturday. Rhianan Rudd took ...

Prince Andrew's top advisor reportedly ignored warnings from MI5 over an alleged Chinese spy two years before the Duke of York's scandal unravelled. Dominic Hampshire allegedly continued to rake ...

A spy at Berlin's British embassy, who sold secrets to Russia and was caught in an undercover MI5 sting, has been jailed for 13 years and two months. David Smith, 58, tried to damage Britain's ...

One dissident giving evidence on the scale and seriousness of the threat has been shot twice by IRGC agents and only survived a fatal bullet when the gun jammed ... the head of MI5 20 ...