"This issue needs to be thoroughly looked into… Surely, we need to find out what happened to the money. But we should be aware of the circumstances surrounding the events," Marek Biernacki said in an interview with the Polish television channel TVN24.
On December 9, the US Senate Intelligence Committee released a 500-page report that revealed the torture techniques used by the CIA on suspected terrorists in the aftermath of the 9/11 attacks in Washington and New York.
The report did not specifically name other countries involved in the renditions of suspects or hosting CIA "black site" torture camps, but Human Rights Watch said in a report that Poland was one of them. Amnesty International said Poland hosted a secret US prison at Stare Kiejkuty from 2002 to 2005.
Kwasniewski is reported to have publicly acknowledged the existence of CIA "black sites" in Poland, saying that eventually the cooperation with the United States in this respect ceased after certain practices raised concerns.
According to media reports, Polish authorities received from $15 million to $30 million in exchange for providing sites to the CIA that the agency could use as interrogation facilities.
In July 2014, the European Court of Human Rights said that Poland failed to protect human rights as it hosted secret CIA prisons on its territory. An investigation into the allegations was opened in Poland in 2008 and is still underway.