Iran has further increased its stockpile of uranium enriched to near weapons-grade levels, a confidential report by the UN nuclear watchdog said Saturday, and called on Tehran to urgently change course and comply with the agency's probe.

The news comes at a sensitive time as Tehran and Washington have been holding several rounds of talks in recent weeks over a possible nuclear deal that U.S. President Donald Trump is trying to reach.

The report by the Vienna-based International Atomic Energy Agency (IAEA) — which was seen by The Associated Press — says that as of May 17, Iran has amassed 408.6 kilograms of uranium enriched up to 60 per cent.

That's an increase of 133.8 kilograms — or almost 50 per cent — since the IAEA's last report in February. The 60 per cent enriched material is a sh

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