At the start of the First World War, it was responsible for the arrest of enemy spies, or suspected enemy spies. Throughout the First World War, Germany continually attempted to infiltrate Britain, but MI5 was able to identify most, if not all, of the agents dispatched.

Spies working for states fall into two categories: intelligence officers and agents. Intelligence officers are members of intelligence services. They will be highly trained in espionage...

Explore the ever-changing world of espionage and security threats through original case files, photographs and papers, alongside the real equipment used by spies and spy-catchers over MI5’s...

Oct 18, 2023 · More than 20,000 people in the UK have now been approached covertly online by Chinese spies, the head of MI5 said. It comes amid a new warning to tens of thousands of …

Jan 14, 2025 · More than 100 secret MI5 files have been declassified for the first time, shedding light on the lives of five of Britain’s most infamous KGB spies. New information is revealed about the confessions...

Apr 4, 2025 · MI5 goes public: Spy agency lifts the veil on 115 years of secrets A new exhibition at the National Archives in London offers a rare glimpse into the shadowy world of espionage, spotlighting dramatic double-crosses, royal intrigue, and the evolving face of British intelligence.

MI5 Director General Ken McCallum said his agents and police have tackled 20 “potentially lethal” plots backed by Iran since 2022 and warned that it could expand its targets in the United …

Jan 14, 2025 · Confessions of double agents and tips for new spies have been released as part of a tranche of recently-declassified documents from MI5. The documents are part of a new exhibition on display at...

Oct 11, 2022 · Was he a Nazi spy? He was interned as enemy alien while MI5 tried to determine which of the five accounts of his journey to the UK might contain a modicum of truth.

Feb 12, 2025 · MI5 lied to three courts while defending its handling of a misogynistic neo-Nazi state agent who attacked his girlfriend with a machete, the BBC can reveal. Arguing for secrecy, the Security...