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VIENNA — Israeli strikes have destroyed two buildings making centrifuge components for Iran's nuclear programme at Karaj, just outside the capital Tehran, the International Atomic Energy Agency said Wednesday.
In another strike on a site in Tehran, "one building was hit where advanced centrifuge rotors were manufactured and tested", the agency added in a post on X.
Iran's supreme leader Ayatollah Ali Khamenei vowed on Wednesday that his country would show no mercy towards Israel's rulers, hours after US President Donald Trump demanded Tehran's "unconditional surrender".
"We must give a strong response to the terrorist Zionist regime. We will show the Zionists no mercy," Khamenei posted on X.
Israel last week launched an unprecedented bombing campaign hitting Iranian nuclear and military facilities, as well as residential areas.
Iran has responded by launching missiles and drones, and early Wednesday said it had fired hypersonic missiles at Israel.
On Tuesday, Trump demanded the Islamic republic's "unconditional surrender" and boasted that the United States could easily assassinate Khamenei.
Tehran's ambassador to the United Nations in Geneva said Wednesday has said that Iran will respond "strongly" to any aggression from either Israel or Washington.
"We will respond strongly and we will stop aggression from any side, be it Israel or the United States," Ali Bahreini told a press conference.
"And we have given a message to the United States that we will respond very firmly and will stop the aggression by anybody -- including the United States," he said.
After decades of enmity and a prolonged shadow war, Israel says its surprise air campaign that began on June 13 is aimed at preventing Iran from acquiring nuclear weapons -- an ambition Tehran denies.
Bahreini told the UN correspondents' association that Tehran was "resolute in responding to Israeli attacks".
"We will respond very, very, very seriously and strongly, and that is what we are doing now. Nobody should expect Iran to show any kind of restraint," he said.
He also criticised the attitude of Western and European nations.
"When you look at the positions of different countries, Western countries, European countries, not only they are not condemning the attacks and aggression, they are trying to justify the aggression," he said.