Who was the mastermind behind the 1993 World Trade Center bombing?

Ramzi Yousef (born 27 April 1968) is a Pakistani convicted and incarcerated international terrorist who was one of the main perpetrators of the 1993 World Trade Center bombing, the bombing of Philippine Airlines Flight 434, and was a co-conspirator in the Bojinka plot (planned to assassinate Pope John Paul II).

He was tried in the U.S. District Court for the Southern District of New York along with two co-conspirators and was convicted of planning the Bojinka plot. He received two life sentences plus 240 years for his part in the 1993 World Trade Center bombing and Bojinka plot.

The 1993 World Trade Center bombing was a terrorist attack on the World Trade Center, carried out on February 26, 1993, when a truck bomb detonated below the North Tower of the World Trade Center in New York City. The 1,336 lb (606 kg) urea nitrate–hydrogen gas enhanced device was intended to send the North Tower (Tower 1) crashing into the South Tower (Tower 2), bringing both towers down and killing thousands of people.