Twenty-eight torture rooms were found in the de-occupied part of Kharkiv region, three of them are still not documented due to heavy shelling in the areas of their location, the Interior Ministry of Ukraine has said.

"Investigators of the National Police have found 28 torture rooms in Kharkiv region since the moment of its de-occupation. This is the largest number in Ukraine. Three of them still remain undocumented due to the fact that they are located in the heavily shelled settlements close to the border with Russia," it said on the Telegram channel on Wednesday.

The National Police have found 88 prisons and torture rooms, where the Russian forces had illegally captured and tortured people, in the de-occupied territories since the beginning of the full-scale invasion.

"The most high-profile one is the case of a Kupyansk torture room. Sixty-seven people were officially recognized as victims who suffered from the occupiers' hands in this torture room, however the police know that more than 150 people suffered from tortures there. Some of them were captured for more than 100 days," it said.

The victims include schoolchildren, retirees, teachers, heads of local enterprises and farmers, the ministry said.

"Currently, the task of the investigators is to establish and identify all Russian soldiers, LPR/DPR [the so-called 'Luhansk and Donetsk People's Republics'] activists and collaborators-traitors involved in torturing Ukrainians, and submit all these cases to court," it said.