Unclear or Nuclear?

Two articles on the WaPo website:
Evidence on Iran Called Unclear
and (AP bylined)
Iran Announces Plans to Turn Uranium into Nuclear Weapons Substance
From the second article:

The issue of enrichment is extremely sensitive as the international community tries to determine if Iran is using its nuclear program for peaceful purposes only, as Tehran insists, or trying to make weapons.
...
Iran agreed to suspend its enrichment program last year in an effort to build international trust. But that commitment eroded over the subsequent months, and in July, Iran confirmed reports that it had resumed building nuclear centrifuges.

Recall that Iran is not lacking for energy, since it's the second biggest producer in OPEC.