Iran has failed to explain traces of uranium found at several undeclared sites, according to a new report by the UN nuclear watchdog showed which was obtained by Reuters on Monday.

"After many months, Iran has not provided the necessary explanation for the presence of the nuclear material particles at any of the three locations where the Agency has conducted complementary accesses (inspections)," says the report by International Atomic Energy Agency (IAEA) chief Rafael Grossi to member states.


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