Investigation of Russian hack on London hospitals may take weeks amid worries over online data dump

An investigation into a ransomware attack earlier this month on London hospitals by the Russian group Qilin could take weeks to complete, the country’s state-run National Health Service said Friday, as concerns grow over a reported data dump of patient records.

Hundreds of operations and appointments are still being canceled more than two weeks after the June 3 attack on NHS provider Synnovis, which provides pathology services primarily in southeast London.

The attack affected King’s College and Guy’s and St Thomas’ hospital trusts, which run several south London hospitals,