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.
Middle East latest – follow live updates after reports of explosions
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, where there were reports of blasts, as well as sites associated with its nuclear program.
Iranian state TV said its nuclear facilities remain unharmed, Reuters news agency reported.
Dubai-based carriers Emirates and FlyDubai began diverting around western Iran at about 4.30am local time.
They did not explain, though local warnings suggested the airspace may have been closed.
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.
But a person familiar with the matter told Sky News’s US partner network NBC News that Israel carried out an operation in Iran tonight.
They added separately that Israeli officials notified US officials today that a response was coming.
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