Ramzi Yousef (; born 20 May 1967 or 27 April 1968) is a Pakistani convicted terrorist who was one of the main perpetrators of the 1993 World Trade Center bombing and the bombing of Philippine Airlines Flight 434; he was also a co-conspirator in the Bojinka plot. In 1995, he was arrested by the Pakistani Inter-Services Intelligence (ISI) and U.S. Diplomatic Security Service at a guest house in Islamabad, Pakistan, while trying to set a bomb in a baby doll, then extradited to the United States.