ST. LOUIS (AP) — Golfweek is reporting the PGA of America is trying to regain control of computer servers that have kept officials from accessing files for the PGA Championship.

The magazine says on its website that PGA staff members discovered their systems had been compromised when attempts to access files generated a message that the network had been penetrated and that any attempt to break the encryption could cause files to be lost.

The PGA of America declined comment, saying it was an ongoing investigation.

Golfweek reports the files included promotional banners and logos that are used in digital and print communications, and on digital signage around Bellerive Country Club.

The magazine says the message included a Bitcoin wallet number, without stating what was required to regain control of the files.