PM Donald Tusk has now commented on the investigation into the CIA black site in Stare Kiejkuty. According to news agency PAP, he is constantly in touch with President Bronisław Komorowski and General Prosecutor Andrzej Seremet regarding the matter.
He added that the prosecutors investigating the case were "not released from their obvious duty of care for the interests of the country."
He also said: "As far as it is possible for the government, we will be trying to prevent any negative consequences of the investigation and the elucidation of the case, but it will come to light. Nobody can prevent this, neither in Poland nor on the other side of the ocean."
In further remarks, he warned all those working on the case not to leak, to be imprecise or overzealous.
The case was moved to a different jurisdiction, after the former head of the Secret Service, Zbigniew Siemiątkowski, had been interrogated under caution, and accused of crimes against humanity.
Siemiątkowski is currently serving a three year suspended sentence for an unrelated case. He has another previous conviction, and currently works a lecturer at Warsaw University.
Previous coverage of the case.
Council of Europe report on the complicity of European countries in CIA rendition.
Photos of Stare Kiejkuty, including the secluded building in the woods.