A number of procedures have been cancelled or redirected to other NHS providers after a cyber attack affected major hospitals in the capital.
King's College Hospital, Guy's and St Thomas' (including the Royal Brompton and the Evelina London Children's Hospital) and primary care services were hit by the "major IT incident" involving pathology partner Synnovis, letters sent to NHS staff said.
Trusts reported the incident was having a "major impact" on the delivery of services, with blood transfusions particularly affected.
A spokesman for King's College Hospital in London confirmed it was affected.
The incident is thought to have occurred on Monday, meaning some departments could not connect to their main server.
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