Iran's Atomic Energy Organization spokesman Kamalwandi said on the 13th that Iran has sent information to the International Atomic Energy Agency about the traces of uranium found at three undeclared sites, answered questions and held dialogue sessions to resolve ambiguities.
According to reports, the director general of the International Atomic Energy Agency, Grossi, said on the 12th that Iran has not yet "provided a technically credible explanation" for the traces of uranium found in three undeclared sites.
According to the website of the Atomic Energy Organization of Iran, Kamalwandi said in response to Grossi's remarks on the 13th that nuclear contamination was only observed in a few places and cannot be regarded as a sign of the existence of undeclared nuclear material.
The IAEA's comments were based on documents provided by Israel, which were provided for "specific political purposes".
In July 2015, Iran reached a comprehensive agreement on the Iranian nuclear issue with the United States, the United Kingdom, France, Russia, China and Germany.
In May 2018, the United States unilaterally withdrew from the agreement, and subsequently restarted and added a series of sanctions against Iran.
Since May 2019, Iran has gradually suspended the implementation of some of the terms of the agreement, but promised that the measures taken are "reversible".
From April 2021, the parties to the Iran nuclear deal will hold several rounds of talks in Vienna, the capital of Austria, to discuss the issue of the US and Iran resuming the implementation of the treaty, and the US indirectly participates in the negotiations.