A European investigator says the American CIA ran secret prisons in Poland and Romania for terror suspects with the approval of the two countries' leaders.
Swiss Senator Dick Marty, in a report to the Council of Europe, says though Polish and Romanian leaders knew of their existence, the prisons were run directly and exclusively by the CIA.
Polish and Romanian officials have rejected all the allegations.
The European Commission has called on European Union member states named in the report to hold independent investigations into the charges.
The report, the second by Marty on the centers, says among those held and interrogated in Poland were senior al-Qaida figures Abu Zubaydah and Khalid Sheikh Mohammed.
The report says Poland and Romania hosted the centers, beginning in 2003, under a special program launched after the September 11, 2001 terrorist attacks in the United States.
Marty noted evidence of secret flights to Poland as proof of the pivotal role the countries played in the program.
Late last year, President Bush acknowledged there had been secret detention centers, but said they were, by then, empty.
Some information for this report was provided by AFP, AP and Reuters.