Iran has grounded commercial flights across parts of the country after reports of explosions.
State media also said Iran fired its air defence systems after reports of blasts near the city of Isfahan.
It remained unclear if the country was under attack.
Middle East latest – follow live updates after reports of explosions
But tensions remain high in the wider Middle East after Iran’s missile and drone attack on Israel over the weekend.
The Israeli military did not immediately respond to a request for comment, AP reported.
Iran’s state-run IRNA news agency said its air defences fired across several provinces – but did not elaborate on what caused the batteries to fire.
State television noted a “loud noise” in the area.
A major airbase for the Iranian military is in Isfahan, as well as sites associated with its nuclear program.
Iranian state TV said its nuclear facilities remain unharmed, Reuters news agency reported.
This breaking news story is being updated and more details will be published shortly.
Please refresh the page for the fullest version.
You can receive breaking news alerts on a smartphone or tablet via the Sky News app. You can also follow @SkyNews on X or subscribe to our YouTube channel to keep up with the latest news.
