Iran’s foreign minister issued a stern warning to the Israeli government earlier today. In an interview with CNN, Hossein Amir-Abdollahian cautioned that Iran’s response to any attacks from Israel would be “decisive, definitive and regretful.”

“We do not seek to create tension and crisis or increase such situations in the Middle East, and we sincerely hope the Israeli regime does not repeat this egregious error,” he added.

State-backed Iranian media FARS reported that nuclear sites in Isfahan are safe amid an Israeli strike on the country.

“Some reports from foreign news agencies about incidents in these facilities is incorrect,” reported the news agency, which is aligned with the Islamic Revolutionary Guard Corps.

Isfahan is in central Iran. A military factory there was attacked last year.

The U.S. was not involved in Israel’s strike in Iran, a source familiar with the situation confirmed, adding that there was a pre-notification to the U.S. from the Israelis about the strike.

A source in Israeli Prime Minister Benjamin Netanyahu’s office declined to comment on the reported strike in Iran.

The Israel Defense Forces spokesman’s office did not immediately respond to a request for comment.

Flights in the Iranian cities of Tehran, Isfahan and Shiraz were suspended Friday morning, the state-run IRNA news agency reported amid reports of a possible strike in the country.

“The flights out of these airports have not been canceled up to this point, they have been suspended. Passengers before leaving, check flight information,” the news agency said on Telegram.

A person familiar with the situation told NBC News that Israel carried out an operation in Iran tonight.

Separately, Israeli officials notified U.S. officials earlier today that a response was coming.

The Israeli Embassy in Washington declined to comment on whether Israel has launched an attack on Iran.

The CIA declined to comment.

President Joe Biden told Israeli leaders that while the U.S. commitment to defend Israel is ironclad, the U.S. would not participate in offensive operations against Iran, a senior administration official told NBC News.

U.S. officials have told NBC News that Washington was concerned about Israel’s responding quickly without thinking through the potential fallout.

Iran “will not hesitate a bit to assert its inherent right to give a decisive and proper response” to any use of force against it by Israel, Iran’s foreign affairs minister told the United Nations today.

Hossein Amirabdollahian said that Iran’s attack Saturday on Israel, which he said was a forced response to Israel’s April 1 attack on is embassy in Syria, was over.

“Iran’s legitimate defense and countermeasures have been concluded,” Amirabdollahian said. “Therefore the Israeli regime, the terrorist Israeli regime, must be compelled to stop any further military adventurism against our interests.”

“Certainly in case of any use of force by the Israeli regime and violating our sovereignty, the Islamic Republic of Iran will not hesitate a bit to assert its inherent right to give a decisive and proper response to it, to make the regime regret its actions,” he said.

Iran’s attack by drones and missiles was mostly thwarted, but some damage was done in Israel, officials said.

Two Iranian Revolutionary Guard Corps commanders — Gen. Mohammad Reza Zahedi and Gen. Mohammad Hadi Haji Rahimi — were killed in the Israeli strike on an Iranian consular building in Syria. Five other Revolutionary Guard members were also killed.