The government said it would also punish those responsible for the data disclosure, which were distributed en masse on Saturday evening on the Telegram.
“The forces, means and technologies available to internal bodies make it possible to identify and convict the vast majority of those guilty of disclosing personal data on the Internet,” said Interior Ministry spokeswoman Olga Chemodanova.
The loyalty of the security forces is crucial for Lukashenko to cling to power after the elections at the beginning of last month, after which he won for the sixth term, but opponents said the result of the vote was rigged.
Security forces have detained thousands of people in an attempt to stem the tide of protests and strikes in the country.
The government said 390 women were detained on Saturday in a rally against Lukashenko. Most have been released in the meantime.
Lukashenko’s crackdown on protests has prompted the European Union to impose new sanctions on the Minsk government.
The government reacted angrily on Saturday after reports surfaced that opposition candidate Svetlana Tsikhanouskaya could soon meet with EU foreign ministers.
Russian Foreign Ministry spokeswoman Maria Zakharova also criticized the European Union for inviting Tsikhanouskaya to the ministerial meeting and for considering sanctioning Belarus.
New protests are scheduled in the country on Sunday.