British security services thwarted 15 Iranian plots to murder or kidnap people in the UK. But more funding is needed to ...

The British state has an evolved and sophisticated suite of powers and tools - but the shape of the threat has shifted ...

At the heart of the case is the violent abuse of a woman by a state agent under MI5's control. After the BBC began ...

A ruling by London's High Court cited the domestic intelligence agency's failure to explain why representatives had ...

The regulator rewrote a draft report which had contradicted MI5’s false evidence, the BBC can reveal.

MI5 has offered an “unreserved” apology to the High Court saying there had been “failings and errors” in legal proceedings related to an alleged source accused of abusing two women.

A BBC investigation revealed that the spy agency had lied to three courts about a misogynistic agent who used his MI5 role to coerce and terrorise his girlfriend.

MI5 accepts that the status of a neo-Nazi agent should no longer be protected, after previously refusing to confirm if they were an informant A BBC investigation found MI5 had given false evidence ...