UN nuclear watchdog: Iran removing 27 surveillance cameras

Mr Grossi said the move poses a "serious challenge" to its efforts, warning that in three to four weeks, it would be unable to maintain a "continuity of knowledge" about Iran's programme.

"This would be a fatal blow" to negotiations over Iran's tattered nuclear deal with world powers, Mr Grossi said.

"When we lose this, then it's anybody's guess," he added.

Iran did not immediately acknowledge it was removing the cameras, though it threatened on Wednesday to take more steps amid a years-long crisis that threatens to widen into further attacks across the Middle East.

Mr Grossi said that would leave "40-something" cameras still in Iran. The sites that would see cameras removed include its underground Natanz nuclear enrichment facility, as well as its facility in Isfahan, Mr Grossi said.

"We are in a very tense situation with the negotiations over the (nuclear deal) at a low ebb," Mr Grossi added. "Now we are adding this to the picture; as you can see it's not a very nice one."

On Wednesday, Iran said it shut off two devices the IAEA uses to monitor enrichment at Natanz.

Mr Grossi acknowledged that, saying that among the devices being removed was the Online Enrichment Monitor and flowmeter. Those watch the enrichment of uranium gas through piping at enrichment facilities.

Iran's decision comes as the IAEA's board censured Tehran over what the agency calls the Islamic Republic's failure to provide "credible information" over man-made nuclear material found at three undeclared sites in the country.

The IAEA earlier on Thursday said Mr Grossi told members that Iran informed the agency that it planned to install two new cascades of the IR-6 at Natanz. A cascade is a series of centrifuges hooked together to rapidly spin uranium gas to enrich it.

An IR-6 centrifuge spins uranium 10 times as fast as the first-generation centrifuges that Iran was once limited to under its nuclear deal with world powers. As of February, Iran already had been spinning a cascade of IR-6s at its underground facility at Fordo, according to the IAEA.

Iran earlier said it planned to install one cascade of IR-6s at Natanz. The IAEA said it "verified" the ongoing installation of that cascade on Monday, while the newly promised two new cascades had yet to begin.

Iran and world powers agreed in 2015 to the nuclear deal, which saw Tehran drastically limit its enrichment of uranium in exchange for the lifting of economic sanctions.

In 2018, then-President Donald Trump unilaterally withdrew America from the accord, raising tensions across the wider Middle East and sparking a series of attacks and incidents.

Talks in Vienna over Iran's tattered nuclear deal have been stalled since April. Since the deal's collapse, Iran runs advanced centrifuges and has a rapidly growing stockpile of enriched uranium.

Non-proliferation experts warn Iran has enriched enough up to 60% purity - a short technical step from weapons-grade levels of 90% - to make one nuclear weapon should it decide to do so.

Iran insists its programme is for peaceful purposes, though UN experts and Western intelligence agencies say Iran had an organised military nuclear programme through 2003.

Building a nuclear bomb would still take Iran more time if it pursued a weapon, analysts say, though they warn Tehran's advances make the programme more dangerous.

Israel has threatened in the past that it would carry out a preemptive strike to stop Iran - and already is suspected in a series of recent killings targeting Iranian officials.

Iran already has been holding footage from IAEA surveillance cameras since February 2021 as a pressure tactic to restore the atomic accord.

The Atomic Energy Organisation of Iran, which runs its civilian nuclear programme, published video it said showed its workers turning off both regular and back-up battery power for two IAEA cameras on Wednesday.

The censure resolution at the IAEA meeting in Vienna, sponsored by Germany, France, the UK and US, passed with the support of 30 of 35 governors.

Russia and China voted against, Russian ambassador Mikhail Ulyanov wrote on Twitter. India, Libya and Pakistan abstained.

After the vote, a joint statement from France, Germany, and the UK and the US said the censure "sends an unambiguous message to Iran that it must meet its safeguards obligations and provide technically credible clarifications on outstanding safeguards issues".

Iran's Foreign Ministry meanwhile criticised the censure as a "political, incorrect and unconstructive action".

An Iranian official earlier warned IAEA officials that Tehran was now considering taking "other measures" as well.

"We hope that they come to their senses and respond to Iran's co-operation with co-operation," said Behrouz Kamalvandi, an Iranian nuclear spokesman. "It is not acceptable that they show inappropriate behavior while Iran continues to cooperate."

Israeli Prime Minister Naftali Bennett praised the vote as "a significant decision that exposes Iran's true face".

The "IAEA vote is a clear warning light to Iran: If Iran continues its activity, the leading countries must bring the matter back to the UN Security Council," said Mr Bennett, who made an unannounced trip on Thursday to the United Arab Emirates.

Chinese Foreign Ministry spokesperson Zhao Lijian called the US "the culprit in the Iranian nuclear crisis" and urged America to "respond positively to the legitimate concerns of the Iranian side".