The UN's nuclear watchdog said Wednesday that Iran's explanations over the presence of nuclear material at an undeclared site in the country were "not credible."

The news comes as observers watch to see whether Joe Biden's victory in the US presidential election will lead to detente between Iran and Western powers.

Despite Iranian authorities providing some information about the site, "the agency informed Iran that it continues to consider Iran's response to be not technically credible," the International Atomic Energy Agency (IAEA) said in a report seen by AFP.

"A full and prompt explanation from Iran regarding the presence of uranium particles of anthropogenic origin... at a location in Iran not declared to the agency is needed," the report said.

While the IAEA has not identified the site in question, diplomatic sources have indicated to AFP that it is in the Turquzabad district of Tehran, previously identified by Israel as an alleged site of secret atomic activity.

A source familiar with the issue said there was no indication the site had been used for processing uranium but that it could have been used for storing it as late as the end of 2018.

Iran's ambassador to the IAEA, Kazem Gharib Abadi, wrote on Twitter that "any hasty comments should be avoided".

"Interactions are ongoing with a view to finalize the resolution of the matter," he added.

- 'Sabotage' -

The report did not provide any new information about two separate locations where the IAEA took samples in September and where undeclared nuclear activity may have taken place in the early 2000s.

The analysis of those samples is ongoing.

It however confirmed that Iran's stockpile of enriched uranium is now more than 12 times the limit set down in a 2015 deal with world powers, even if the rate at which the stockpile is expanding has slowed since the last report.

The 2015 accord has been progressively unravelling since US President Donald Trump withdrew from the deal in May 2018 and went on to re-introduce crippling economic sanctions on Iran.

In retaliation, Iran has been breaking the limits on its nuclear activity laid down in the deal since May 2019.

As well as breaching limits on the stockpile amount and enrichment level of uranium laid down in the 2015 Joint Comprehensive Plan of Action (JCPOA), Iran has been using more advanced centrifuges than permitted under the deal.

Wednesday's report confirmed that, in line with previous statements by Iranian officials, centrifuges had been installed at an underground part of the Natanz nuclear facility after another part of the site was damaged in an explosion in July which Iran blamed on "sabotage".

- 'Maximum pressure' -

The three European powers who are still party to the 2015 deal, namely France, the UK and Germany, have been scrambling to find ways to keep the accord intact.

The election of Trump's Democrat opponent Joe Biden as the next US president has offered some hope the deal could be revived, as Biden has offered Iran a "credible path back to diplomacy".

On Wednesday Iranian President Hassan Rouhani said the country would take "any opportunity" which could "lift the pressure of sanctions from the shoulders of our people".

However, obstacles remain to any detente.

Iran insists that the US has to lift sanctions imposed by the Trump administration before it will come back into compliance with the JCPOA's limits.

The "maximum pressure" campaign on Iran launched by the Trump administration has seen Tehran's distrust of the Americans intensify and tensions between the two countries have twice brought them to the brink of war since mid-2019.

Biden will face a tight window of opportunity between his inauguration on January 20 and an Iranian presidential election set for June 18 in which reformists and moderates allied to Rouhani may face a tough challenge from conservatives.

On Friday US Secretary of State Mike Pompeo will start a tour of US allies, including several of Iran's neighbours, during which he is expected to discuss raising further pressure on Tehran in the remaining two months of the Trump administration.

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