Rafael Mariano Grossi, director general of the International Atomic Energy Agency, has shared his concerns about the Iran-Israel conflict with the agency’s board of directors.

“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,” Grossi said on June 16. “Consistent with the objectives of the IAEA and its statute, I call on all parties to exercise maximum restraint to avoid further escalation.”

Iran has begun enriching uranium to a purity level of 20 percent using advanced IR-6 centrifuges at its Fordow Fuel Enrichment Plant, a pilot facility located underground near the city of Qom. The Atomic Energy Organization of Iran made the public announcement on June 10, although it reported the news to the United Nations’ International Atomic Energy Agency two weeks before, according to NBC News.