Israel’s attack on Iran on October 26 destroyed an active Iranian nuclear weapons research facility in the Parchin military complex, according to U.S. and Israeli officials. The facility, known as Taleghan 2, contained equipment for designing the shaped plastic explosives used to detonate a nuclear weapon and is part of a recent effort by the Iranian government to conduct research that could be used to develop nuclear weapons. The facility was part of the Amad Plan, a pre-2004 Iranian program to develop nuclear weapons.