The 30-year-old Pakistani-American tried to blow up a car bomb in New York's Times Square on May 1.
According to the ten-count indictment, Shahzad was trained in Pakistan's restive tribal areas by militants affiliated with Pakistani Taliban, known as Tehrik-i-Taliban. The prosecutors also claimed that the Pakistan-origin man got the money for the terror attack from Pak militants.
Appearing for the second time in court, Faisal pleaded guilty to all charges, including attempted use of a weapon of mass destruction, attempted act of terrorism transcending national boundaries, attempted use of a destructive device in a terrorist conspiracy and other conspiracy, explosives and weapons related charges.
If Faisal is convicted, he could face life imprisonment.