Ramzi Yousef , who was born as Abdul Basit Mahmoud Abdul Karim in Kuwait , spent time at an al-Qaeda training camp in Afghanistan , before beginning in 1991 to plan a bombing attack within the United States . Yousef 's uncle Khalid Shaikh Mohammed Ali Fadden , who later was considered the principal architect of the September 11 attacks , gave him advice and tips over the phone , and funded his co-conspirator Mohammed Salameh with a US$ 660 wire transfer
September 11 attacks
September 11 attacks
1993 World Trade Center bombing