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Next 9/11 shock might be being planned where we're not looking, UK's MI5 chief says

Ken McCallum said al Qaeda and other militants still seek mass-casualty attacks, while state-backed sabotage and cyberattacks are also rising.

  • Director General Ken McCallum warned Friday that Britain faces a greater risk of strategic shock than on 9/11, writing in the Independent on the 25th anniversary that security agencies must adapt to new, unforeseen threats.
  • Islamist militants remain a threat with aspirations for mass casualty attacks, McCallum noted, citing a recently foiled plot to kill hundreds in gun attacks on the Jewish community in Manchester.
  • MI5 faces rising state-backed aggression, ranging from sabotage by criminal proxies to cyberattacks on power stations. The agency must confront these diverse dangers simultaneously, McCallum added.
  • Modern infrastructure now relies on the private sector, requiring government, business, and academia to collaborate. This shift complicates efforts to close vulnerabilities and respond swiftly during crises, McCallum noted.
  • McCallum urged resilience and courage to adapt before the next shock arrives, writing, "We owe the victims of 9/11 and those who will otherwise become the victims of tomorrow's attack something more than remembrance.
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Lean Left

Britain faces a greater and more complex threat than in 2001, according to the head of MI5 military counter-intelligence, Sir Ken McCallum. In addition to the persistent dangers arising from Islamic extremism, he said there are a number of state threats.

Lean Left

Ken McCallum called for stronger resistance in Britain.

Right

“The next strategic shock, by definition, will not look like the last, this is perhaps the most important lesson of all,” McCullum writes in an article for the Independent newspaper

·Marousi, Greece
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The Independent broke the news in London, United Kingdom on Friday, September 11, 2026.
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