The plot was simple: Blow up a dozen U.S. jets with bombs assembled on board using liquid in household containers.
Terrorists still copy his plans — including Project Bojinka, Yousef's blueprint for mass murder. Tom Corrigan, a former New York detective who investigated Yousef while on the FBI-NYPD terrorist task force, said similarities between the Bojinka plot and British plots are alarming.
Pat D'Amuro, a former FBI assistant director, said the London plot shows that terrorists "like to come back to areas, like they did the World Trade Center."
Yousef's uncle, Khalid Shaikh Mohammed, who was captured in Pakistan in 2003, is called the mastermind of the September 11, 2001, terrorist attacks.