MI5 Chief Warns of Rising Threat from Biological Weapons

Ken McCallum highlights the potential for terrorists to utilize biological weapons in his annual security address.

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Aapla Nagpur Desk
22 Oct 2026, 10:00 AM IST · 2 min read
Source: Defence24
MI5 Chief Warns of Rising Threat from Biological Weapons
KEY TAKEAWAYS
1

MI5's Ken McCallum warns about the imminent risk of biological weapon use by terrorists.

2

Technological advancements, including AI, are increasing the threat level.

3

Historical context shows a long-standing evolution of biological warfare tactics.

In a significant warning regarding national security, Ken McCallum, the Director General of MI5, addressed the potential for terrorists to employ biological weapons during his annual speech on October 13. He expressed concerns that advancements in technology could enable malign actors to develop and deploy such weapons, potentially using drones powered by artificial intelligence. McCallum emphasized that while he did not wish to sound alarmist, the threat is real and growing.

The context of this warning is rooted in a broader historical understanding of biological warfare, which has been utilized for centuries. Notably, the Hittites in the 14th century BC and Alexander the Great in the 4th century BC employed methods that could be classified as biological attacks. The 20th century saw a marked escalation in the development and use of biological weapons, particularly during World War II and the Cold War, with the USSR reportedly capable of producing significant quantities of anthrax annually.

Recent statements from industry leaders, such as Stéphane Bancel, CEO of Moderna, further underscore the urgency of this issue. Bancel noted that the ease of developing a virus in a garage poses a new risk, not only from radical groups but also from hostile states engaging in hybrid warfare. The convergence of terrorist organizations, state-sponsored actors, and criminal enterprises creates a dangerous triad that complicates global security dynamics.

The implications of biological weapon use extend beyond immediate physical harm; they include psychological impacts, media attention, and potential for widespread panic. The World Health Organization has also raised alarms about antibiotic resistance, which exacerbates the threat posed by biological agents. With millions of deaths attributed to antibiotic-resistant infections annually, the stakes are alarmingly high.

Looking ahead, the international community must grapple with the growing threat of bioterrorism. Intelligence reports and expert warnings indicate that preparedness is crucial. The question remains whether governments will heed these warnings and take the necessary steps to mitigate this evolving threat in the coming years.

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MI5 Chief Warns of Biological Weapons Threat