The statement was made ahead of a conference of the Board of Governors of the International Atomic Energy Agency (IAEA).
"Iran has enriched enough uranium for three nuclear bombs," the source said.
Discussions are expected to last about a week, after which the Board is expected to make a decision critical of Iran, for the first time in 2.5 years. At the same time, the decision is not expected to be harsh enough to lead to international sanctions on Iran, or even to a United Nations Security Council discussion on the matter.
The source emphasized that the detailed information regarding the scope of Iran's uranium enrichment appears in one of the two reports submitted to the Board of Governors by IAEA chief Rafael Grossi.
"The report examined the original nuclear deal," the source added. The report shows a worrying picture, of large quantities of uranium being enriched to 20% and to 60%. The enriched material is defined as SQ 3, indicating enough for three nuclear bombs. It is important to emphasize, however, that this material requires another purification process to bring it from the current level of 60% enrichment to the level of 90% enrichment required to manufacture a nuclear bomb. Thus far, there is no indication that Iran has completed this process.
The source added that the IAEA is expected to reach a decision critical of Iran since Iran has been caught in lies which it can no longer excuse. READ MORE