The Sportadmin app has been subjected to a cyberattack, reports several media outlets.
It has been established that data has leaked, but what and how much is unknown, writes the company behind the app in a comment.
Sportadmin is used by approximately 1,700 sports associations in the country and has one million children and adults as members. It is used, among other things, to administer training sessions and association information.
The data breach was discovered on Thursday morning and led to the system being shut down. It is not possible to log in to the app or website.
The intrusion has been reported to the police, according to Sportadmin.