The Arms Control Association on 9th July said that the US intelligence community has assessed that Iran has the scientific, technical, and industrial capacity to eventually produce nuclear weapons and the IAEA continues to investigate outstanding issues related to Iran’s nuclear weapons-related research before 2004. It says that there are 2 routes for Iran (or any state) to obtain sufficient fissile material to make nuclear weapons — using highly enriched uranium or plutonium. It attached to the news item a fact file which details the major scientific, technical, and industrial steps required to build a uranium or plutonium weapon.
https://www.armscontrol.org/sites/default/files/files/documents/BuildingNuclearWeapons.pdf
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