The list of those thought to be held by the CIA include suspected al-Qaeda members Khalid Sheikh Mohammed, Nurjaman Riduan Isamuddin, Ramzi bin al-Shibh, and Abu Zubaydah. The total number of ghost detainees is presumed to be at least one hundred, although the precise number cannot be determined because fewer than 10% have been charged or convicted. However, Swiss senator Dick Marty's memorandum on "alleged detention in Council of Europe states" stated that about 100 persons have been kidnapped by the CIA on European territory and subsequently rendered to countries where they may have been tortured. This number of 100 persons does not overlap, but adds itself to the U.S.-detained 100 ghost detainees.