A cyber security incident is affecting shared IT systems and resident services across several London councils, including Kensington and Chelsea, Hammersmith and Fulham, and Westminster City.

Authorities have activated support from Monday morning, bringing in specialist cyber incident experts and the National Cyber Security Centre to protect data, restore systems, and maintain essential services.

Hammersmith and Fulham said precautionary measures are in place to review, isolate, and protect networks and to restore services as quickly as possible.

It is too early to determine attribution or motive, with ongoing investigations into potential data compromises and incident management.

RBKC and Westminster City Council (WCC) have pledged to update residents and partners as more information becomes available, noting that it is not yet clear who is responsible or whether data was affected.

Officials say there is no definite attribution yet and investigations continue to establish whether any data was compromised.

Analysts point to a possible global context, noting patterns of government-targeted attacks and the potential impact on sensitive local authority data.

Industry experts describe the incident as a serious intrusion with risks of lateral movement within a shared environment and potential disruption to social care, housing, and safeguarding services.

Experts urge shifting from merely preventing breaches to building ongoing resilience, including modernizing ageing tech to keep pace with AI-enabled cyber threats.

Authorities are coordinating communications, urging staff cooperation, and promising ongoing updates as the situation develops.

The situation remains ongoing with a commitment to transparency and regular updates over the coming days.

Live updates from MyLondon are tracking dates, statements, and evolving responses from councils and national agencies as more information becomes available.