Investing.com -- The risk of Iran secretly developing nuclear weapons has increased since US and Israeli military strikes on the country in June 2025, Bloomberg reported Wednesday, citing new data from the International Atomic Energy Agency.

The IAEA reportedly warned member countries about new nuclear proliferation dangers from Iran's stockpile of near-bomb-grade uranium in a restricted internal document. Before the air assault that started a 12-day war, the material was inspected weekly by the IAEA to prevent diversion for weapons use. Those inspections no longer occur.

The IAEA's report shows how the US-Israeli war on Iran created new nuclear problems that did not exist before. The longer the material stays outside IAEA monitoring, the greater the risk it could be used for non-peaceful purposes, it concluded.

The Agency "can't draw any conclusion regarding this nuclear material," states the 119-page restricted document circulated last month in Vienna. "This gives rise to a proliferation concern as this nuclear material, which the agency was not able to verify, includes a large amount of high-enriched uranium."

Inspections dropped by more than half last year after Iran imposed new restrictions following the 12-day war. Monitors have not returned to damaged sites in Fordow, Isfahan and Natanz, where Iran's 440.9 kilograms and 8,599.6 kilograms of lower enriched material was last observed.

The White House maintains Iran's nuclear program has been destroyed but has sought to negotiate access to the uranium. US President Donald Trump has suggested the material could be exported from Iran or made inert under IAEA supervision domestically.

Officials worry the US administration's failure to include the IAEA in recent negotiation rounds may create new risks and raise unrealistic expectations.

"We are not a party to this negotiation. We participated until the last round which ended in February," IAEA Director General Rafael Mariano Grossi told Al Jazeera on Tuesday. "Something that is not verifiable will lead to a bad agreement."

The IAEA board meeting is scheduled to start on June 8 in Vienna. The US and Israel attacked Iran less than 24 hours after the agency's Feb. 27 report suggested activity near bombed nuclear sites. Last June's strikes followed a day after the IAEA's board censured Iran over blocking its inspectors.