US intel links Iran with nuke bomb bid

Over the past two years, the U.S. already has shared material on a laptop computer reportedly smuggled out of Iran. In 2005, U.S. intelligence assessed that information as indicating that Tehran had been working on details of nuclear weapons, including missile trajectories and ideal altitudes for exploding warheads.
After declassification, U.S. intelligence also was forwarded on two other issues: the "Green Salt Project" — a plan the U.S. alleges links diverse components of a nuclear weapons program, including uranium enrichment, high explosives testing and a missile re-entry vehicle — and material in Iran's possession showing how to mold uranium metal into warhead form.
Iran's new generation of advanced centrifuges have begun processing small quantities of the gas that can be used to make the fissile core of nuclear warheads.