Sept 11 conspirators: Where are they now?
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It took 19 men to hijack four airliners and crash them in New York, Washington and Pennsylvania on September 11, 2001, killing nearly 3,000 people.
But a much larger network of conspirators was involved in planning, funding and carrying out the attacks, and governments around the world have been after them ever since.
Some have been captured or killed and some remain at large or unidentified. A decade later, more than half of those charged in the United States have yet to stand trial.
The following people have been convicted, charged, investigated or named as co-conspirators in legal proceedings connected directly to the September 11 plot and attacks:
OSAMA BIN LADEN
WHO: The leader of al Qaeda at the time of the September 11 attacks. Born in Saudi Arabia, he later moved to Afghanistan and then Pakistan.
WHAT: Bin Laden was never indicted for the plot, but was charged by U.S. authorities with the 1998 U.S. embassy bombings in Kenya and Tanzania, as well as in connection with conspiracies to destroy U.S. property and kill Americans. He was also named as an unindicted co-conspirator in a case against Zacarias Moussaoui. All criminal charges against bin Laden were dismissed following his death.
WHERE: Killed by U.S. forces in a private house in Abbottabad, Pakistan, on May 1, 2011, and buried at sea.
WHO: Al-Zawahri, who founded and led the Egyptian Islamic Jihad organization until its 1998 merger with al Qaeda, is a physician from Egypt. He was a top bin Laden deputy at the time of the attacks and now is al Qaeda's leader.
WHAT: Al-Zawahri was named as an unindicted co-conspirator in the Moussaoui case. He was never charged over the 9/11 plot, but has been charged with the 1998 embassy bombings in Kenya and Tanzania.
WHERE: Remains at large. The FBI has offered a $25 million reward for information leading to his capture.