Civil action is being taken by relatives of September 11 attacks victims , insurers and others against the Saudi Arabian government . In the course of this Zacarias Moussaoui has stated on oath and wrote to Judge George B. Daniels that Saudi royal family members helped finance the September 11 attacks and al-Qaeda . Prince Turki bin Faisal Al Saud , Prince Bandar Bin Sultan and Prince Al-Waleed bin Talal , of the Saudi royal family were specifically mentioned as Al-Qaeda donors — but the project 's major patrons was Prince Salman bin Abdulaziz Al Saud , who in January 2015 became Saudi Arabia 's king . Moussaoui 's testimony provides new details of the extent and nature of that support in the pre-9 / 11 period . Judge Leonie M. Brinkema declared " Moussaoui is completely competent " , called him " an extremely intelligent man " and added : " He has actually a better understanding of the legal system than some lawyers I 've seen in court "
September 11 attacks
September 11 attacks
Zacarias Moussaoui