MI5

The head of MI5 has described the scale and pace of the current terror threat as the highest he’s ever seen. In the first on-camera briefing to journalists in the agency’s history, Andrew Parker said attacks are now able to accelerate from plan to intent within days.

MI5 is carrying out a review of its procedures after concerns over security and reported intelligence blunders surrounding the Manchester bomber Salman Abedi. In the campaign against terrorism it is one of the most difficult questions: when do the authorities act on the flood of information about potential extremists. We now know that members of…

A British journalist working for the Daily Express newspaper is said to have leaked highly sensitive secrets to the Russians during the Second World War.

A former army intelligence officer says he alerted MI5 to abuse at Kincora boys’ home, but was told to stop digging. It is not the first time MI5 has been accused of covering up child abuse.

As the IPCC announces it is looking into claims detectives covered up child abuse by politicians and police officers, MI5 faces questions over what it knew and whether it tried to suppress evidence.

Australia, Britain and France have been hit by terrorists previously known to the authorities. Are the security services letting us down, or do we have unrealistic expectations of what they can do?

The UK head of counter-terrorism says British security services are now dealing with 100 potential terror offences each week, with more than half involving referrals into de-radicalisation programmes.

Exclusive: Moazzam Begg tells Channel 4 News that MI5 gave him the green light to go to Syria. So why was he charged with terror offences and locked up for seven months?

After an EU ruling from April questioned current UK data law, the government wants to force through an emergency law allowing telecoms companies to go on collecting and storing data.

New KGB files reveal what Soviets thought about two of the UK’s most famous double-agents Guy Burgess and Donald Maclean – and they were not very impressed.

Exclusive: a recording of the voice of Guy Burgess – the most colourful and notorious of the cold war spies – has come to light thanks to a freedom of information request to the FBI.

“Pattern-of-life” analysis has emerged as a new buzz term in revelations about the National Security Agency. But what is it? And how does it connect shopping with spying?

How much do we know about the spymasters who stepped out of the shadows to face the television cameras? Channel 4 News has the scoop on the snoopers.

Revelations about British and American surveillance operations have played into the hands of terrorists who are “rubbing their hands with glee”, the heads of Britain’s intelligence agencies tell MPs.