Polish authorities have long denied that the country hosted one of the “black sites,” part of a network of clandestine overseas prisons where suspected prisoners from Al Qaeda were subjected to brutal interrogation methods under the C.I.A.’s so-called rendition program. Prosecutors in Poland are investigating the country’s possible participation in the program.

The Polish Air Navigation Services Agency confirmed that it provided the flight logs to the two rights groups, the Open Society Justice Initiative and the Helsinki Foundation for Human Rights. The logs showed six flights in 2003 by two aircraft, a Gulfstream V and a Boeing 737, five of which originated in Kabul, Afghanistan, and one in Rabat, Morocco, before landing at Szymany airport.

Former American intelligence officials have said that the chief plotter of the 9/11 attacks, Khalid Shaikh Mohammed, was interrogated at the secret base near Szymany airport after his capture in 2003, but the agency has refused confirm that. “The agency does not discuss publicly where facilities related to its past detention program may, or may not, have been located,” said a C.I.A. spokesman, Paul Gimigliano.

Adam Bodnar, head of the legal division at the Helsinki Foundation for Human Rights, based in Warsaw, said that after years of anonymous reports, the flight records were the first official confirmation of the C.I.A. flights to Poland. “We are getting closer to the truth,” he said.

“Of course Polish authorities may help the C.I.A. in the fight against terrorism, but they are bound by the Polish Constitution, which prohibits torture,” Mr. Bodnar said.

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