Nuclear reactor, Isfahan, Iran - AP - 2009/2011
Iranian nuclear facility, outside the city of Isfahan, 2009. Photo by AP
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The United States is dismissing Iran's effort to show more transparency over its nuclear program and resume talks with world powers, a senior US diplomat said in Vienna on Wednesday.

Glyn Davies, the US envoy to the International Atomic Energy Agency (IAEA), said that the agency's latest report on Iran shows that Iran is not really answering questions about allegations that it is working on a nuclear weapon.

"Stonewalling the IAEA, flouting UN Security Council obligations and mounting this most recent charm offensive do not reflect a good-faith effort to resolve those concerns," Davies told reporters during a meeting of the IAEA's governing board.

In August, a senior IAEA nuclear inspector was granted a rare one-time visit to Iran's nuclear installations, and Tehran has said it would talk about the weapons allegations, but only under certain conditions.

In a proposal to the US, Britain, France, Germany, Russia and China earlier this month, Iran called for a resumption of negotiations, but suggested it would not stop its uranium enrichment program.

Davies said the six world powers still have to decide how to react to the letter that Saeid Jalili, head of Iran's Supreme National Security Council, wrote to EU foreign policy chief Catherine Ashton, the coordinator of such talks, earlier this month.

But he added: "I don't see, from the standpoint of the work that is going on here, anything new by way of an Iranian commitment to fully address the concerns that the international community has."