More than 25,000 private photographs have been posted online following a data breach at a plastic surgery clinic in Lithuania in March.
Passport and credit card details were also stolen from the Grozio Chirurgija clinic, Lithuanian police said.
After the release of hundreds of photos from the clinic in March, the rest of the database was published on Tuesday.
Patients in Denmark, Germany, Norway and the UK have received demands for ransoms of up to 2,000 euros (£1,737).
Lithuanian police say it is unclear how many of the clinic’s clients have been affected but dozens have reported receiving such demands.
Officers said a hacking group called Tsar Team was behind the theft and publication of the data.
