Several government websites were replaced with a warning message.

This morning, Ukrainian citizens were unable to access several websites owned and run by the Ukrainian government. In the websites’ place was a warning message in several languages informing users that their data had been stolen.

“Ukrainian! All your personal data has been uploaded to the public network. All data on the computer is destroyed, it is impossible to restore them,” the message, written in Ukrainian, Russian and Polish, read. “All information about you has become public, be afraid and wait for the worst. This is for you for your past, present and future. For Volhynia, for the OUN UIA, for Galicia, for Polesie and for historical lands.”

Ukrainian authorities are already working to restore control of the sites to their proper owners and determine how much, if any, data was actually leaked. As for the culprit of the attack, no definitive accusations have been made, but authorities have suspicions.

“According to an investigation by the Center for Strategic Communications and Information Security, the first data suggests that the attack was carried out by the Russian Federation,” the Ukrainian Information Ministry said in a statement.

“This is not the first time or even the second time that Ukrainian Internet resources have been attacked since the beginning of the Russian military aggression,” it added.

Ukraine’s Ministry of Culture and Information Policy has theorized that the threatening message made a deliberate reference to the Organization of Ukrainian Nationalists Ukrainian Insurgent Army, or OUN UIA, as a means of throwing suspicion onto Poland.

“It is obvious that this was done on purpose to cast a shadow over the hacker attack on Poland: Russia and its proxies have been working for a long time to create the quarrel between two friendly neighboring countries,” the ministry said.