Iranian state television reported explosions in Isfahan as air defences were activated and flights across several areas, including the capital Tehran and Isfahan, were suspended.
Irans air defenses said it had brought down three small drones over the central city of Isfahan, hours after US broadcasters said Israeli missiles had hit an Iranian site.
The broadcasters quoted senior US officials.
Iranian state television reported explosions in Isfahan as air defences were activated and flights across several areas, including the capital Tehran and Isfahan, were suspended.
Airspace was reopened about four and a half hours after the incident and there were no reports of casualties.
According to Al Jazeera, a top military official in Isfahan Second Brigadier General Siavash Mihandoust, told state media that air defence batteries hit a suspicious object and there was no damage.
Earlier, ABC News, quoting a senior US official, reported that Israel had launched missiles at a site in Iran. CBS News also reported that an Israeli attack had taken place.
Iranian media said no strikes were launched on Iran from outside the country, and the attack was believed to have been carried out using small quadcopters that would have to have been launched from inside Iran.
Reporting from Tehran, AlJazeeras Dorsa Jabbari said Iranian media was downplaying the incident.
The location in Isfahan province is an Iranian military airbase that belongs to the countrys army, and not the Revolutionary Guards [Islamic Revolutionary Guard Corps, IRGC]. I think its important to highlight that, she said. This base houses multiple squadrons of F-14 Tomcat fighter aircraft.
We also understand that the air defence systems over the city of Tabriz in the northwestern part of Iran were also activated, Jabbari reported.
A military factory belonging to the Iranian army in Isfahan was attacked by multiple quadcopters in January 2023, failing to damage the facility that was protected by air defence batteries and mesh wiring on its roof to counter small unmanned aerial vehicles.
Iran blamed Israel for that attack and arrested four people, executing one of them in January 2024, for operating on behalf of Mossad, the Israeli spy agency.
Iran attacked Israel with a barrage of drones and missiles on April 13, which the latter said were mostly destroyed. Iran said the attack was its response to a suspected Israeli attack on its consulate in Syria which killed seven people, including two IRGC senior generals.
Israel however vowed to respond to Iran''s attack, even though the US advised Tel Aviv against doing so.
Isfahan is considered a strategically important city and one that is host to several important sites, including military research and development facilities, as well as bases. The nearby city of Natanz is the location of one of Irans nuclear enrichment sites.
The International Atomic Energy Agency (IAEA) confirmed that there is no damage to Iranian nuclear sites as the United Nations nuclear watchdogs chief Rafael Grossi called for restraint and said nuclear facilities should never be targeted in military conflicts.
The reported attack was far more limited than many expected, Iranian arms control expert Ali Ahmadi said, adding that Israel has much more limitations in its operational range than many think.
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