Iran has condemned what it describes as "barbaric" US airstrikes on its Fordow, Natanz, and Isfahan nuclear facilities, following an admission of responsibility by US President Donald Trump.

The Atomic Energy Organisation of Iran (AEOI) denounced the attacks as a blatant violation of international law, particularly the Nuclear Non-Proliferation Treaty (NPT).

The AEOI's statement, issued on June 22, noted that President Trump claimed responsibility for the assaults, which reportedly occurred in the early hours of morning. It called upon the international community to condemn this "lawlessness based on the rules of the jungle" and to support Iran in exercising its "rightful rights."

Despite the strikes, the AEOI affirmed that the development of this "national industry", a reference to its nuclear programme, would not be halted, vowing to continue its progress with the efforts of "thousands of its revolutionary and motivated scientists and experts."

US President Trump had earlier declared a "very successful attack" by the US on the three Iranian nuclear sites, including the deeply fortified Fordow facility. In posts on his social network, he confirmed that the attacks had been completed and that all planes are now outside Iran's airspace, with a full shipment of bombs dropped on Fordow and all aircraft safely returning home. Congratulating the soldiers, Trump asserted that no other military in the world can do this and called for peace.

Later, speaking alongside the Vice President and the US Secretaries of State and Defence, Trump warned Iran, characterising it as the bully of the Middle East that must now make peace. He threatened that if it doesn't, future attacks will be much bigger and easier, adding, there are a lot of targets left, which could be hit with precision, speed and skill in a matter of minutes.

In the first official reaction from an Iranian official, Foreign Minister Abbas Araghchi condemned the " outrageous" attack, calling it a " a grave violation of the UN Charter, international law and the NPT.”

Writing on X, Araghchi stressed that the United States, as a permanent member of the UN Security Council, had committed an egregious act that "will have everlasting consequences." He affirmed that Tehran " Iran reserves all options to defend its sovereignty, interest, and people" in accordance with the UN Charter's provisions for legitimate response in self-defense. 

Meanwhile, the International Atomic Energy Agency (IAEA) reported that no increase in radioactive radiation levels outside the affected facilities had been detected following the US strikes.

Earlier, some Iranian officials had claimed that the targeted nuclear sites had been evacuated and contained no materials that cause radiation. The latest IAEA report indicates Iran possesses 408kg of uranium enriched to 60%, though the current location of these materials remains unclear.

Iran's Foreign Ministry, in a separate statement, branded the US attacks as "a flagrant and unprecedented violation of the most fundamental principles of the UN Charter and the rules of international law," holding the US government "responsible for the very dangerous effects and consequences" of its actions. The ministry also asserted that the attacks breached Security Council Resolution 2231, which endorsed the 2015 nuclear deal (JCPOA).

Tehran has called for an emergency session of the UN Security Council to condemn the US actions and hold the country accountable, alongside an urgent meeting of the IAEA Board of Governors to address its "legal responsibility."

The Islamic Republic continues to insist its nuclear programme is "peaceful" and asserts that its facilities "were all under the close supervision of the IAEA and the Safeguards Agreement."

Following the strike, Iranian rockets and drones hit locations in Haifa and the surrounding in response to the attacks.