Special agents' blood and urine test results stolen in FBI hack
Experts say the hack could leave agents vulnerable to scams, blackmail and targeted attacks.
Cyber-criminals who hacked the FBI say they have extremely sensitive medical data for thousands of its special agents.
BBC News has seen samples of the stolen "fitness-for-work" medical examinations, which contain information such as blood and urine test results, and doctors' notes mentioning conditions such as a "shellfish and banana allergy".
The records include agents' full names and addresses, as well as references to medical concerns including 'blood in the urine' and 'high cholesterol'.
Professor Ciaran Martin, the former head of the UK's National Cyber Security Centre, has described the hack - if confirmed - "as serious as it gets when it comes to data breaches."