LONDON (NEWSnet/AP) — Investigation into a ransomware attack on London hospitals by Russian group Qilin could take weeks to complete, National Health Service said.

Hundreds of operations and appointments are being canceled more than two weeks after the attack on NHS provider Synnovis.

The attack affected King’s College and Guy’s and St Thomas’ hospital trusts, which run several south London hospitals, as well as clinics and doctors’ practices. A memo to staff called it a “critical incident” and said it had a “major impact” on services, particularly blood transfusions.

NHS England said it has been “made aware” that data connected to the attack have been published online. According to BBC, Qilin shared almost 400GB of data, including patient names, dates of birth and description of blood tests, on a darknet site and Telegram channel.

According to Saturday's edition of the Guardian newspaper, records covering 300 million patient interactions, including results of blood tests for HIV and cancer, were stolen during the attack.

Ransomware involves criminals paralyzing computer systems with malware, then demanding money to release them.

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