MI5’s top interrogator was baffled by Kim Philby, admitting he could not determine whether he was a Soviet spy, according to ...

The newly-declassified documents include details about some of the UK's most notorious spies.

The documents, on display in the National Archives in Kew, West London, suggest the organisation was keen to dismiss any ...

In one of the newly released files, an MI5 officer notes that Blunt said he felt “profound ... A third, Kim Philby, continued ...

Last year it was revealed that MI5 thwarted 43 late-stage terror attacks on British soil. While many were right-wing or ...

Documents newly declassified by MI5, Britain's internal intelligence agency, show the late Queen Elizabeth II was not ...

In new guidelines released this week, the UK Home Office said that such activities could violate stringent national security ...

MI5 reveals confessions of three members of infamous Cambridge Five spy ring as tranche of documents released into National ...

Security industry guns-for-hire are warned they could face jail time if they work for hostile states — even accidentally.

In one of the newly released files, an MI5 officer notes that Blunt said he ... A third, Kim Philby, continued to work for foreign intelligence agency MI6 despite falling under suspicion.

Queen Elizabeth II was kept in the dark about her art advisor being a Russian spy to avoid adding to her worries. Blunt ...