UN nuclear inspectors have found traces of uranium enriched at 27% at Iran's Fordo nuclear site, a confidential report obtained by the BBC suggests.
The report by the nuclear watchdog IAEA comes a day after Iran and world powers held talks on Iran's nuclear programme.
Iran says the aim of the Fordo site is to enrich uranium for civilian use up to a maximum of 20%, and the latest readings could be accidental.
Analysts say 27% would bring Iran closer to making weapons-grade uranium.
The latest report by the International Atomic Energy Agency says Iranian officials told inspectors that the production of such particles "may happen for technical reasons beyond the operator's control".
Iran insists its nuclear work is purely peaceful, but Western countries fear it is
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