Multiple websites across the United Kingdom, including local government and police services, temporarily went offline on Wednesday to address a widespread cybersecurity vulnerability affecting internet infrastructure globally. The precautionary measure followed the discovery of weaknesses in a commonly used computer code, which artificial intelligence tools identified as potentially exposing systems to cyberattacks.

Among the affected entities were the websites of city councils in Edinburgh, Bristol, and Oxford, as well as the Metropolitan Police Service in London. Media organizations also participated in the temporary shutdown, with the BBC removing access to several pages such as its Traitors and Doctor Who homepages to implement security updates.

The National Cyber Security Centre (NCSC), which provided guidance to organizations handling the remediation efforts, emphasized the importance of the coordinated response. The agency indicated that it will maintain vigilance and continue monitoring UK digital infrastructure for any adverse effects stemming from the vulnerability.

Officials urged institutions across the country to proactively take their websites offline where necessary until patches and updates could be applied to strengthen system defenses. The widespread nature of the flaw underscores ongoing challenges in securing the foundational software that supports internet communications globally.