Yemeni national Ramzi Binalshibh allegedly helped with the early planning of the 9/11 plot but failed to obtain a visa to enter the U.S., leaving him to coordinate between Khalid Sheikh Mohammed and operatives in the U.S. He's currently detained at Guantánamo Bay.
The Accused 9/11 Plotters: What Happened to Them?
News that self-confessed 9/11 mastermind Khalid Sheikh Mohammed and four other alleged 9/11 plotters are to be tried in New York will re-focus attention on the 2001 terrorist attacks. TIME takes a look at some of the men alleged to have plotted and carried out the strikes