Iran’s failure to explain uranium traces is ‘big problem’, says IAEA chief

UN nuclear inspectorate chief asks Tehran to come clean' about uranium found at three sites

Iran's failure to provide credible explanations for traces of uranium found at two undeclared sites is a big problem" that is affecting the country's credibility, the head of the UN's nuclear inspectorate, has said.

Rafael Grossi, the director general of the International Atomic Energy Agency (IAEA), also said Iran and the US could not simply return to the old nuclear deal on exactly the same terms as signed in 2015, but needed a new understanding on how to handle Iran's increased nuclear knowledge, and its possession of more advanced centrifuges.