Iran experimenting with high explosives?

Here's a story from CBS news...

Experiments with high explosives, possibly linked to future nuclear weapons tests, were carried out as recently as 2003 in Iran, sources tell CBS News.

International Atomic Energy Agency analysts said they suspect the experiments took place at a huge military complex south of Tehran. Inspectors were permitted only one visit, and saw only part of the site, reports CBS News correspondent Sheila MacVicar.

Despite the lack of access, Sean McCormack, a U.S. State Department spokesman, said, "we are seeing more and more indications" that Iran's enrichment activities have the intended purpose of building a nuclear weapon.