EU member states should carry out a thorough investigation into CIA-run prisons in Europe, where the inmates were subjected to torture, Russian diplomat Konstantin Dolgov said Monday. "Human rights activists are reasonably demanding the government of Poland to finally conduct an effective investigation into secret CIA prisons on its territory. Similar steps should be taken by other EU member states on which territories CIA torture camps operated," the Russian Foreign Ministry’s Special Representative for Human Rights wrote on his Twitter page. Last week, the European Court of Human Rights (ECHR) ruled that Poland violated an international treaty to protect human rights by hosting secret CIA prisons on its territory. The case was filed by two men who charge they were taken to a secret CIA black site in a Polish forest and subjected to torture before being transferred to Guantanamo Bay. An investigation into the detainees' treatment was opened in Poland in 2008 but is still not concluded – a situation that has been condemned by the UN's anti-torture body. Poland is one of a number of European countries accused of hosting secret CIA prisons. Meanwhile, Romania, Bulgaria, and Lithuania also have had allegations made against them for being part of the CIA black site network.