U.S. officials say Iran's leaders are gathering the materials for a nuclear bomb but have not decided to build one. If they do, they'l have to overcome technical hurdles and risk having their work discovered by outsiders. Here are steps Iran might follow to make its first weapon. Read related article.

Staff reports; Nuclear Threat Initiative; James Martin Center for Nonproliferation Studies; Institute for Science and International Security | The Washington Post April 7, 2012
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