A Polish official says that prosecutors have a construction order that proves the CIA wanted a cage for terror suspects built at a secret ‘black site’ prison inside Poland.

Senator Jozef Pinior claims Krakow prosecutors have a document that shows a local contractor was asked to build a cage at Stare Kiekuty, a Polish army based used as a CIA prison for al Qaeda terror suspects in 2002 and 2003.

“In a state with rights,” Pinior told the Polish paper Gazeta Wyborcza, “people in prison are not kept in cages.” He said a cage was “non-standard equipment” for a prison, but standard “if torture was used there.”

Asked if he was sure the cage was for humans, he said, “What was it for? Exotic birds?” He said he has not seen the construction order, but that the Krakow prosecutor’s office, which is investigating the prison, has a copy of it.

This week Gazeta Wyborcza reported that the prosecutor’s office also allegedly has a signed order from Zbigniew Siemiatkowski, the then-head of Polish intelligence, authorizing the creation of the black site. A source told the paper that the agreement has a space intended for an American signature, but that the Americans did not sign the document “because they do not want to sign documents inconsistent with their own Constitution and international law.”