Iranian scientists are alleged to have worked on two secret projects related to different technologies needed to design a nuclear warhead, including a detonation system to fit inside the nose cone of the Shahab. Credit Hasan Sarbakhshian/Associated Press VIENNA — Iran was actively designing a nuclear weapon until 2009, more recently than the United States and other Western intelligence agencies have publicly acknowledged, according to a final report by the United Nations nuclear inspection agency. The report , based on partial answers Iran provided after reaching its nuclear accord with the West in July , concluded that Tehran conducted “computer modeling of a nuclear explosive device” before 2004. It then resumed the efforts during President Bush’s second term and continued them into President Obama’s first year in office. But while the International Atomic Energy Agency detailed a long list […]