Iran's stock of uranium enriched to near weapons grade has grown sharply since it announced a dramatic acceleration in December and there has been no progress on resolving outstanding issues, two reports by the U.

A report by the United Nations’ nuclear watchdog says Iran has accelerated its production of near weapons-grade uranium as tensions between Tehran and Washington rise.

UN nuclear watchdog says Iran's stockpile of uranium enriched up to 60% has reached 274.8 kilograms, notes the accumulation "is of serious concern".