Iran has begun to build a hall in "the heart of the mountains" near its Natanz nuclear site for making advanced centrifuges, Iran's nuclear chief said on Tuesday, aiming to replace a production hall at the facility hit by fire in July.
Iran said at the time that the fire was the result of sabotage and had caused significant damage that could slow the development of advanced uranium enrichment centrifuges.
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"Due to the sabotage, it was decided to build a more modern, larger and more comprehensive hall in all in the heart of the mountain near Natanz. Of course, the work has begun," said Ali Akbar Salehi, according to state TV.
Natanz is the centrepiece of Iran's enrichment programme, which Tehran says is for peaceful purposes. Western intelligence agencies and the UN's nuclear watchdog (IAEA) believe Iran had a coordinated, clandestine nuclear arms programme that it halted in 2003. Tehran denies ever seeking nuclear weapons.
The Natanz uranium-enrichment site, much of which is underground, is one of several Iranian facilities monitored by inspectors of the International Atomic Energy Agency (IAEA), the UN nuclear watchdog.
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A confrontation between arch foes Tehran and Washington has worsened since 2018, when U.S. President Donald Trump withdrew from Iran's 2015 nuclear deal with major powers and reimposed sanctions that have crippled Iran's economy.
Under the deal, Iran agreed to curb its nuclear programme in exchange for the removal of most international sanctions. In reaction to U.S. sanctions, Tehran has gradually distanced itself from the nuclear pact.