The discovery's raised questions about whether Iran is getting closer to creating weapons-grade material for a nuclear bomb.
Inspectors from the International Atomic Energy Agency found traces of uranium enriched up to 27 per cent - more than the 20 per cent maximum level Iran has claimed - when they visited the Fordo enrichment facility in February.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
But the US has cautioned that the trace particles don't necessarily mean Iran is secretly seeking higher enrichment levels.
Share
