MI5 chief warns Britain must build defences against radical Islamic threats

The Director General of MI5 has warned Britain must build defences against radical Islamic threats in an unprecedented intervention. Sir Ken McCallum warned the global terror landscape is more complex than it was twenty-five years ago, according to GB News.

The head of the domestic security service used an article to highlight that modern security challenges involve a combination of persistent extremist ambitions and aggressive state-level actors. Writing on the twenty-fifth anniversary of the 9/11 attacks, the MI5 chief outlined how intelligence operations have shifted significantly since 2001.

The MI5 I lead in 2026 contends with a threat landscape markedly different to 2001’s.

— Sir Ken McCallum, Director General of MI5, The Independent

In his assessment, Sir Ken noted that while international counter-terrorism efforts successfully degraded core terrorist networks over the past two decades, mass-casualty ambitions persist. These non-state dangers now sit alongside strategic national security threats posed by capable foreign states.

• MI5 chief warns of complex security landscape
• Intervention marks twenty-five years since 9/11
• Call for shared national defence effort
• Private sector assets face active threats

The security intervention stresses that protection of critical national infrastructure extends beyond traditional government departments into private sector boardrooms. Officials argue that modern vulnerabilities require a coordinated response across industry, academia, and government.

National security agencies continue to monitor high-level threats while urging institutions to strengthen operational resilience against potential hostile interference and extremist plots.

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p class=”source-link”>Original source: Read the full report at GB News