Have authorities detained people believed responsible for the attacks?
Many of the alleged organizers and associates of the hijackers have been detained around the world, although Osama bin Laden and his chief deputy, Ayman al-Zawahri, remain at large. Alleged Sept. 11 mastermind Khalid Shaikh Mohammed was captured in March in Pakistan along with one of the suspected financiers of the attacks. Mohammed’s aide, Ramzi Binalshibh — a close associate of Mohammed Atta and the other Germany-based hijackers — was detained in September 2002 in Pakistan. Both are being interrogated in secret. Abdelghani Mzoudi, a Moroccan, is on trial in Germany on charges he aided Atta. Mounir el Motassadeq, another Moroccan Hamburg associate, was convicted in February of aiding al-Qaida and sentenced to 15 years in prison. Zacarias Moussaoui, an associate of Binalshibh who took flying lessons in the United States, was charged in connection with the attacks and is awaiting trial. Some high-level al-Qaida prisoners have said he was not directly involved in the Sept. 11 plot.
