"The errors that were discovered concern both authorizations and the storage of personal data on an external storage device", writes Region Stockholm in a press release.
A police investigation is underway, and currently, there is no indication that personal data has reached unauthorized individuals.
The affected personal data is from patients who have sought care at healthcare centers, emergency clinics, rehabilitation centers, geriatric care, or psychiatric care within the Stockholm County healthcare area. Individuals with protected information should not be affected.
Those who want to know if their personal data was stored on the external storage device can contact the region digitally via Always Open or by phone.
The incident, which was discovered in May this year, has also been reported to the Data Protection Authority.