Iran has dramatically increased the amount of near-weapons grade enriched uranium it possesses, according to a report by the International Atomic Energy Agency circulated Saturday to member states in preparation for the agency’s June board meeting.

Iran has increased production of highly enriched uranium, according to the United Nations nuclear watchdog, as the nation conducts talks with the United States on a nuclear deal.

In a confidential report seen by the BBC, the International Atomic Energy Agency (IAEA) said Iran now possesses over 400kg of uranium enriched to 60% purity - well above the level used for civilian purposes and close to weapons grade,