The findings are contained in the European Parliament's first interim report into the alleged CIA abuses.
The inquiry followed media reports and personal testimonies that U.S. intelligence officers interrogated Al-Qaeda suspects at secret prisons in Eastern Europe and transported some of them on secret flights via Europe following the September 11, 2001, attacks.
The author of the report, Giovanni Claudio Fava, said the CIA had made more than 1,000 undeclared flights over European territory since 2001, thereby violating an international treaty.
(Reuters, AP)