MI5 is facing fresh scrutiny in the case of a violent neo-Nazi agent after a High Court judge said he had "no confidence" in the Security Service's account of how a senior officer gave false ...

The U.K.’s top intelligence agency MI5 failed to respond to key information that could have thwarted the 2017 suicide attack at an Ariana Grande concert in northwest England that killed 22 ...

An MI5 agent “deliberately and repeatedly lied” after confirming to a journalist that a violent and misogynistic neo-Nazi was operating as an undercover source, a court has heard. The security ...

MI5 told the court everyone from director general Ken McCallum downwards acknowledged the seriousness of the false evidence MI5 lied "deliberately and repeatedly" as it tried to defend its ...

Foreign spies are using online networking sites to target thousands of Government officials, high-tech businesses and academics, the head of MI5 has warned ... warned that fake profiles were ...

A newly released guide for MI5 "watchers" during World War 2 reveals the intriguing advice new recruits were given - including a surprising warning about facial hair. The instructions came to ...

PA Media A fake Nazi medal, made for one of MI5's most successful wartime agents One of the most striking exhibits is a fake Nazi medal, made for one of MI5's most successul wartime agents.