Iran Acknowledges Uranium Find

But they say that the highly enriched uranium was a contaminant from its previous buyer:

In Vienna, IAEA spokesman Mark Gwozdecky would not comment on the Iranian acknowledgement. He said a team of senior agency inspectors will begin meetings in Tehran on Thursday and they would be joined by “technical experts” on Friday ready to begin a new round of inspections.

A diplomat familiar with the Iran nuclear issue, speaking on condition of anonymity, said there was no way of telling from the samples available to the IAEA whether the Iranian explanation was true.

Salehi said Iranian and IAEA officials were surprised that enriched uranium had been found at the two sites.

It was “unexpected … because it needs a lot of centrifuges to work for a long time to enrich uranium,” he told the TV station. “The IAEA and we know that there has been no such level of activity in Iran.”

Seems honest enough an explanation, and demonstrable if anything else.