TALLINN, Estonia (AP) — A Belarusian hacker activist group claims to have infiltrated the network of the country’s main KGB security agency and accessed personnel files of over 8,600 employees of the organization, which still goes under its Soviet name.

The authorities have not commented on the claim, but the website of the Belarusian KGB was opening with an empty page on Friday that said it was “in the process of development”.

Seeking to back up its claim, the Belarusian Cyber-Partisans group published a list of the website’s administrators, its database and server logs on its page in the messaging app Telegram.

Group coordinator Yuliana Shametavets told The Associated Press from New York that the attack on the KGB “was a response” to the agency’s chief Ivan Tertel, who publicly accused the group this week of plotting attacks on the country’s critical infrastructure, including a nuclear power plant.