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London councils hit by 'cyber attack' with data potentially compromised

Suspected ransomware attack has disrupted IT systems and phone lines across multiple London councils, affecting critical services and potentially compromising residents' data.

  • On Tuesday , multiple London councils escalated their internal cyber threat level to Critical after intelligence indicated several boroughs were targeted within the last 24-48 hours, including Royal Borough of Kensington and Chelsea and Westminster City Council, which have been responding since Monday.
  • Hackney Council staff were sent urgent warnings about phishing and social engineering and told to report suspicious activity immediately because speed is critical.
  • Criminals accessed and encrypted some 440,000 files, phone lines, call centres, and the Report It online service have been disrupted, with systems unlikely to be fully restored before the end of this week.
  • Authorities have activated contingency measures and asked national cyber agencies to investigate, with the Information Commissioner's Office informed and the Metropolitan Police Cyber Unit and National Crime Agency engaged.
  • The National Cyber Security Centre said, `We are aware of an incident affecting some local authority services in London and are working to understand any potential impact`, with experts warning that attackers can move through connected systems faster than councils can respond.
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My London broke the news in London, United Kingdom on Tuesday, November 25, 2025.
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