London, July 18 -- One of Britain's most damaging data breaches has rocked the UK's defence establishment, compromising the identities of over 100 British operatives-including MI6 officers and special forces soldiers-as well as nearly 19,000 Afghans who assisted British troops during the war in Afghanistan.

The revelation has sparked outrage in Westminster and raised serious national security concerns.

The accidental leak that took place in February 2022 went undetected until August 2023.

The data breach involved sensitive personal data from nearly 19,000 Afghans who had applied to relocate to the UK under resettlement schemes due to the risk of Taliban reprisals, BBC reported.

A British soldier inadvertently emailed over 30,000 resettl...