MI5 chief calls for society-wide security effort against terrorism and state aggression

A rare intervention from Britain’s security chief

MI5 Director General Ken McCallum has used the 25th anniversary of the September 11 attacks to urge a society-wide response to a security environment in which terrorism now overlaps with pressure from hostile states. In a rare public intervention reported by Sky News on Friday, McCallum argued that responsibility for national resilience can no longer remain concentrated inside intelligence agencies and central government. Businesses, universities and the public increasingly control or operate systems that adversaries may target, making their participation essential to prevention and crisis response.

Two categories of danger are converging

McCallum’s assessment separates the threat landscape into enduring mass-casualty terrorism and strategic aggression conducted below the threshold of conventional war. The first includes networks inspired by groups such as al-Qaeda and Islamic State. The second includes sabotage outsourced to criminals, covert interference in democratic institutions and destructive cyber operations against infrastructure. He did not publicly identify individual states in the anniversary article, although established British assessments have repeatedly focused on activity linked to Russia, Iran and China.

The intervention matters because the ownership of critical assets has changed since 2001. Telecommunications, energy networks, research facilities, data systems and key supply chains are often managed outside government. Decisions that determine whether a vulnerability is fixed may therefore be made in corporate boardrooms or university leadership teams rather than in a national emergency committee. McCallum’s proposed answer is a connected network of government, industry and academia that can share responsibility and act before a crisis exposes unclear ownership or authority.

Policy is moving toward broader resilience

The British government’s 2026 legislative programme provides institutional context for that message. Its national-security proposals cited a recent rise in investigations involving state threats and described espionage, infrastructure targeting, surveillance, arson and physical violence among the risks requiring stronger legal tools. The policy direction is therefore broader than conventional counterterrorism: it seeks mechanisms for restricting hostile state entities while improving the resilience of organisations that hold sensitive technology or operate essential services.

The immediate question is whether McCallum’s appeal produces operational commitments rather than another general warning. Measures to watch include new information-sharing arrangements, corporate reporting duties, university research safeguards, infrastructure exercises and clearer lines of responsibility during cyber or sabotage incidents. His anniversary intervention does not announce a specific imminent plot or a change in Britain’s terrorism threat level. It instead reframes security as a distributed national function at a moment when hostile-state activity and terrorist ambition must be managed simultaneously.