UN Nuclear Chief Warns Israel's Bombing of Iranian Facility Risks Radiation Release
IAEA head Rafael Grossi implored "all parties to exercise maximum restraint to avoid further escalation."
The head of the United Nations nuclear watchdog cautioned Monday that Israel's bombing of Iran's primary uranium enrichment facility raises the risk of radiological and chemical contamination, a warning that came amid condemnation of such strikes and mounting civilian casualties on both sides of the widening war.
Addressing an emergency session of the International Atomic Energy Agency's Board of Governors in Vienna, IAEA Director General Rafael Grossi said that "military escalation threatens lives, increases the chance of a radiological release with serious consequences for people and the environment, and delays indispensable work towards a diplomatic solution for the long-term assurance that Iran does not acquire a nuclear weapon."
"Last week the board adopted an important resolution on Iran's safeguards obligations," Grossi continued. "The resolution, while containing important proliferation-related provisions, also stressed support for a diplomatic solution to the problems posed by the Iranian nuclear program. Member states of the IAEA have a crucial, active role to play in supporting the urgent move away from military escalation towards diplomacy."
"Consistent with the objectives of the IAEA and its statute, I call on all parties to exercise maximum restraint to avoid further escalation," he added.
Based on info available to the IAEA, this is the current situation at the Iranian nuclear sites in Natanz, Fordow, Khondab, Bushehr, and Esfahan. pic.twitter.com/gTvJrYzPFW
— IAEA - International Atomic Energy Agency ⚛️ (@iaeaorg) June 16, 2025
The IAEA affirmed that Israeli strikes have damaged above-ground areas of the uranium enrichment facility at Natanz and another nuclear site in Isfahan. Grossi said earlier that four buildings in Isfahan had been damaged by Israeli strikes on Friday, but noted Monday that there were no apparent signs of damage to another enrichment plant at Fordow, which is deep underground.
Experts say it would likely take intervention by the United States—which has more powerful bunker-busting bombs than Israel—to destroy the Fordow site. U.S. President Donald Trump said Sunday that "it's possible" that American forces could enter the fight, while the apparent deployment of what The Times of Israel on Monday called an "unprecedented" number of U.S. Air Force aerial refueling planes fueled speculation of deeper American involvement in the war.
Grossi's warning came amid widening Israeli bombing of Iran and retaliatory Iranian strikes against Israel. Iran's Ministry of Health said Monday that 224 people—90% of them civilians—have been killed and over 1,400 others wounded by Israeli attacks. Iranian media reported serious damage to a hospital in the western city of Kermanshah following Israeli bombing.
Last week, Israel began bombing Iranian government, military, and nuclear sites and assassinating numerous Iranian nuclear scientists. Some of these attacks have also killed targeted scientists' relatives, neighbors, and other civilians. The far-right government of Israeli Prime Minister Benjamin Netanyahu says Israel is attacking Iran in order to prevent the country from developing nuclear weapons. However, critics note that U.S. intelligence agencies concur that Iran is not trying to develop nukes.
As is the case with Gaza—where Israel is waging a war for which Netanyahu is wanted by the International Criminal Court for alleged crimes against humanity and war crimes—numerous observers accuse the Israeli leader of creating a distraction from his ongoing criminal corruption trial in his own country.
On Monday, Iranian Foreign Ministry spokesperson Esmaeil Baghaei said that Iran's legislative body, the Majlis, was drafting a bill that would withdraw the country from the landmark 1968 Treaty on the Nonproliferation of Nuclear Weapons.
Meanwhile, at least 23 Israeli civilians including women and children and Palestinian citizens of Israel have been killed by Iranian missile and drone strikes that have been condemned as indiscriminate. Hundreds more Israelis have been wounded. Responding to these attacks, Israeli Defense Minister Israel Katz—who is accused of supporting genocidal policies in Gaza—said over the weekend that Iran's capital "will burn" if Iranian forces did not stop responding to Israel's bombing.
"The residents of Tehran will pay the price, and soon," he vowed.
