DUBAI/WASHINGTON/TEHRAN: The United States received advance notice of Israel’s reported strike on Iran but did not endorse the operation or play any part in its execution, US media quoted officials as saying.

NBC and CNN, citing sources familiar with the matter and a US official, respectively, said Israel had provided Washington with pre-notification of the strike.

Various networks cited officials confirming a strike had taken place inside Iran, with CNN quoting one official as stating the target was not a nuclear facility.

Israel told the United States on Thursday it would be retaliating against Iran in the coming days, a senior US official told CNN.

“We didn’t endorse the response,” the official said, according to CNN.

There was no immediate comment from the White House about the Israeli strike.

In response to a query from AFP, the Pentagon duty desk said: “We do not have anything to offer at this time.”

Iran activated its air defense system over several cities, state media reported, after the country’s official broadcaster said explosions were heard near the central city of Isfahan.

Israel warned it would hit back after Iran fired hundreds of missiles and drones at its arch-foe over the weekend. Most of them were intercepted.

That weekend barrage came in the wake of an attack on Iran’s consulate in Damascus widely blamed on Israel.

Tehran’s two major airports resumed flights on Friday, state media reported, following a brief suspension after explosions were heard in central Iran.

“Flights through Imam Khomeini and Mehrabad airports have resumed,” the official IRNA news agency reported.

Commercial flights began diverting their routes early Friday morning over western Iran without explanation as one semiofficial news agency in the Islamic Republic claimed there had been “explosions” heard over the city of Isfahan.

Some Emirates and Flydubai flights that were flying over Iran early on Friday made sudden sharp turns away from the airspace, according to flight paths shown on tracking website Flightradar24.

“Flights over Isfahan, Shiraz and Tehran cities have been suspended,” state media reported.

Iranian officials said its air defenses did shot down several drones but there had been “no missile attack for now” on the country.

The state-run IRNA news agency reported that Iran fired air defense batteries early Friday morning across several provinces after reports of explosions near the city of Isfahan.

Several drones “have been successfully shot down by the country’s air defense, there are no reports of a missile attack for now,” Iran’s space agency spokesman Hossein Dalirian says on X.

The Fars news agency said “three explosions” were heard near the Shekari army airbase near Isfahan.

Iran’s local media also reported that nuclear facilities in Isfahan were “completely secure” after explosions were heard near the area.

“Nuclear facilities in Isfahan province are completely secure,” Tasnim news agency reports, quoting “reliable sources.”

Israel had said it would retaliate against Iran’s weekend attack, which involved hundreds of drones and missiles in retaliation for a suspected Israeli strike on its embassy compound in Syria. Most of the Iranian drones and missiles were downed before reaching Israeli territory.

Several Iranian nuclear sites are located in Isfahan province, including Natanz, centerpiece of Iran’s uranium enrichment program. Isfahan, Isome 350 kilometers (215 miles) south of Iran’s capital, Tehran, is also home to a major air base for the Iranian military.

Meanwhile in Iraq where a number of Iranian-backed militias are based, residents in Baghdad reported hearing sounds of explosions, but the source of the noise was not immediately clear.

In Syria, a local activist group said strikes hit an army position in the south of the country Friday. 

“There were strikes on a Syrian army radar position,” said Rayan Maarouf, who runs the Suwayda24 anti-government website that covers news from Sweida province in the south.

Iranian military positions in Syria had been frequently targetted by Israeli air strikes over the past years. Early this month, an Israeli strike demolished a consular building annex of the Iranian Embassy in Sydia's capital Damascus, killing 13 people, including two generals of Iran's Revolutionary Guards, triggering the Iranian missiles and drones attack on Israel on April 13.

At the United Nations Security Council on Thursday, Iran urged member nations that Israel “must be compelled to stop any further military adventurism against our interests” as the UN secretary-general warned that the Middle East was in a “moment of maximum peril.”

Israel had said it was going to retaliate against Iran’s April 13 missile and drone attack.

Analysts and observers have been raising concerns about the risks of the Israel-Gaza war spreading into the rest of the region.

Oil prices and jumped on the reports of the Israeli strike. Brent crude futures rose 2 percent to $88.86 a barrel, the dollar gained broadly, gold rose 1 percent and S&P 500 futures dropped 1 percent.

Israel’s assault on Gaza began after Palestinian Islamist group Hamas attacked Israel on Oct. 7, killing 1,200, according to Israeli tallies.

Israel’s military offensive has killed over 33,000 Palestinians in Gaza, according to the local health ministry.

Iran-backed groups have declared support for Palestinians, launching attacks from Lebanon, Yemen and Iraq.