That news related to this one https://www.bloomberg.com/news/articles/2023-01-13/bulgaria-charges-four-people-in-probe-into-crypto-lender-nexo

Those four people were found by authorities doing some shady activities like money laundering and those people were linked to the nexo. That's why the police raided nexo's office. The decision that already been made by authorities to prevent shady things like money laundering and unlicensed banking activities.

I think that the reasons are quite clear if you wanna try to read other news before the police raided Nexo's office.