Iranian media said the announcement would be made around 1000 GMT.

According to Iran's Arabic satellite channel Al-Alam, Tehran is expected to say that it "is ready to negotiate on all articles" in an international proposal which offers incentives in exchange for a freeze of sensitive nuclear work.

A freeze of uranium enrichment work, however, has been presented by the West as a non-negotiable precondition to any further talks.

Last week Britain, China, France, Germany, Russia and the United States decided to send Iran's case back to the Security Council after Tehran failed to respond to the offer.

Iran says it only wants to enrich to levels needed to make reactor fuel and that this is a right under the nuclear Non-Proliferation Treaty.

The technology can, however, be extended to make weapons, which has led to demands for a suspension while a probe by the UN nuclear watchdog, the International Atomic Energy Agency, is still in progress.