Russia trying to create 'mayhem' on UK streets, MI5 boss warns

Russia is trying to create "mayhem" on the UK's streets, the head of the MI5 has warned.

In a wide-ranging speech, the organisation's director general Ken McCallum said Britain faces an increased threat from "Putin's henchmen" and "plot after plot" from Iran.

He also revealed a growing number of children are being investigated for terrorism in the UK.

It comes as Islamic terrorism is also re-emerging, with Mr McCallum saying "the trend that concerns me most [is] the worsening threat from Al Qaeda and in particular from Islamic State".

"After a few years of being pinned well back, they've resumed efforts to export terrorism," he added.

Over the last month, more than a third of MI5's top priority investigations have had links to organised overseas terrorist groups.

Mr McCallum revealed that, overall, MI5 and the police have disrupted 43 "late-stage" terrorist plots since March 2017.

He said some plotters planned mass murder through the use of firearms and explosives.

The split of MI5's counter-terrorism work is roughly 75% Islamist and 25% extreme right-wing, although Mr McCallum described a "dizzying range of beliefs and ideologies" as people access a range of online hatred, conspiracy theories and disinformation.

In his first speech of its kind in two years, Mr McCallum said his team had "a hell of a job on its hands" and painted a picture of a multifaceted threat facing the UK, with resurgent terrorist organisations such as Al Qaeda and IS, in addition to state terrorism from countries such as Iran and Russia.

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Mr McCallum said state threat work has risen 48% in a year, revealing that since January 2022, MI5 and the police have responded to 20 potentially lethal Iran-backed plots.

He said the threat from Iran has increased "at an unprecedented scale", warning that it - along with Russia - were "using proxies" such as organised criminals to "do their dirty work".

More than 750 Russian diplomats, many of them spies, have been expelled from Europe since Russian President Vladimir Putin invaded Ukraine.

While this has dented Russian intelligence services, Mr McCallum said they are on a "sustained mission to generate mayhem on British and European streets" with "arson, sabotage and more".

He had a message to criminals considering taking on work for hostile states, saying: "If you take money from Iran, Russia or any other state to carry out illegal acts in the UK, you will bring the full weight of the national security apparatus down on you. It's a choice you'll regret."

Mr McCallum also offered counter-sabotage support to businesses through MI5's protective security arm, the National Protective Security Authority (NPSA).

But the statistic that 13% of people under investigation were children was one of the most unexpected developments - it is a three-fold increase in three years.

Mr McCallum said MI5 is seeing "far too many cases where very young people are being drawn into poisonous online extremism".

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He added: "Extreme right-wing terrorism in particular skews heavily towards young people, driven by propaganda that shows a canny understanding of online culture."

Speaking later in an off-camera briefing, Mr McCallum said the fact that one in eight of the people his organisation investigates are under-18 was "not something I expected to see".

As yet, the conflict in the Middle East has had little impact on UK terrorism.

Mr McCallum referenced last October's knife attack in Hartlepool but said: "We are powerfully alive to the risk that events in the Middle East trigger terrorist action in the UK... [but] thus far, while our police colleagues have responded to rising public order, hate crime and community safety challenges, we haven't - yet - seen this translate at scale into terrorist violence."

(c) Sky News 2024: Russia trying to create 'mayhem' on UK streets, MI5 boss warns