Environmental activists said on Monday that the fire, near the site of the world's worst nuclear disaster in 1986 and believed to have been started deliberately, posed a radiation risk.
As the two rivals came close to fighting an all-out war, here's a look back at how Tehran's nuclear ambition first began—with help from Washington.
Iran's President Hassan Rouhani said Tehran would begin injecting gas into centrifuges at the Fordow plant, a restriction it had originally accepted in return for lifting international sanctions.
President Hassan Rouhani says Tehran will continue to reduce its nuclear commitments until European parties to the pact save it by protecting Iran's economy from US penalties.
Former Tepco Chairman Tsunehisa Katsumata and executives Sakae Muto and Ichiro Takekuro were all found not guilty in the only criminal case emerging from the nuclear meltdown.
Saudi's new energy minister Prince Abdulaziz bin Salman says Riyadh is "proceeding with it cautiously ... we are experimenting with two nuclear reactors."
The plant, loaded with nuclear fuel, will replace a coal-fired power plant and an ageing nuclear power plant supplying more than 50,000 people with electricity. Rosatom says the plant is safe, but environmentalists voice concerns.
Iran has exceeded the upper limit of its low-enriched uranium reserves for the first time after the US withdrew from the accord last year. The UN's atomic watchdog also confirmed the breach in a report.
A spokesman for Iran's atomic agency said Tehran would increase uranium enrichment levels "based on the country's needs".
Last week, Iran notified China, France, Germany, Russia and the UK of its decision to halt some commitments under the 2015 nuclear deal, a year after the US unilaterally withdrew from the accord and re-imposed sanctions.
A nuclear technology expert says Riyadh is a year away from completing the building of its first nuclear reactor. A separate report says the kingdom is issuing a multi-billion-dollar tender in 2020 to construct its first two nuclear power reactors.
Reuters news agency says Washington has okayed six authorisations by companies to sell nuclear technology and assistance to Riyadh.
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