One of Slovenia’s largest gambling and tourism groups has begun reopening its casinos after a cyberattack forced them to shut down for several days.

Hit, which operates casinos, hotels and other tourism businesses in Slovenia and Bosnia and Herzegovina, said it detected a cybersecurity incident early last week. The attack on the company’s servers forced six Hit-operated casinos to close for roughly three days.

In a statement Friday, Hit said it had restored enough of its IT infrastructure to gradually reopen the affected casinos, but some gaming functions and its loyalty system remained unavailable. Guests were initially limited to a selection of slot-machine games while the company worked to restore other systems and applications.

“Maintaining and further strengthening our IT infrastructure and security will remain one of the company’s development priorities going forward,” Sandi Bratasevec, chairman of Hit’s management board, said in a statement.

Hit has not provided a further update on whether operations have since fully returned to normal. As of Monday, the notice on the company’s website still said it was operating on a limited basis, with table games and bingo not yet available.

The company has disclosed few details about the attack, and has not said whether any data was stolen or disclosed how hackers gained access to its systems. It has also not said whether a ransom was demanded or paid.