Some MI5 material relating to its involvement with a teenager who was charged with terrorism before taking her own life is ...

Widening the definition of terrorism could overwhelm the police and MI5, the lawyer carrying out a review of the definition ...

Newly declassified British documents show that Queen Elizabeth II wasn’t told details of her long-time art adviser's double life as a Soviet spy because palace officials didn’t want to add to her ...

Some MI5 material relating to its involvement with a teenager who was charged with terrorism before she took her own life is being “withheld” from her inquest but is “not a cause for concern”, a ...

Jonathan Hall KC warned that football hooligans and criminal gangs could technically be classed as terrorists under Sir ...

A defendant in an alleged Russian spy ring case told police he had already spoken to MI5 when he was arrested, the Old Bailey ...

A World War II-era guide to tailing a target, and files on notorious double agents such as Kim Philby, feature in MI5: ...

A closer look at recently declassified MI5 files on the intelligence failure surrounding the five "Cambrdige spies" ...

Avoid facial disguises, carry loose change and be ready to make split-second decisions: just some of the advice Britain’s ...

Rookie wartime MI5 "watchers" were advised they needed to be prepared to offer a big tip if they had to tell a taxi driver to "follow that cab" when pursuing a suspect, newly declassified ...

The PSNI has refused to say if MI5 officers were involved in a stop and search of republican mourners returning from the wake ...