Iran is building a giant underground bunker for its nuclear fuel production facilities, prompting concerns that the country really is trying to build nuclear weapons. David E. Sanger at The New York Times reports:

The head of Iran’s atomic energy agency, Fereydoon Abbasi, spoke about the transfer in general terms on Monday to an official Iranian news service. He boasted that his country would produce the fuel in much larger quantities than it needs for a small research reactor in Tehran that produces medical isotopes.

The fact that Iran is declaring that its production will exceed its needs has reinforced the suspicions of many American and European intelligence officials that Iran plans to use the fuel to build weapons or to train Iranian scientists to produce bomb-grade fuel.

The United Nations' International Atomic Energy Agency said in a report released on Friday that they're "increasingly concerned" about the possibility that Iran is building nukes, citing "possible existence in Iran of past or current undisclosed nuclear related activities" and "activities related to the development of a nuclear payload for a missile." The Associated Press points out that this is the first time the United Nations has used such serious terms to describe the situation.