This is the terrifying moment Iran's sky lights up with rockets as the world watches nervously on.

Israel and Iran have squared up in recent days with a spate of threats being issued as Tel Aviv's war with Hamas continues.

But tensions took a dramatic turn on Friday morning when it emerged Israel had attacked Iran, with explosions reportedly heard in Isfahan.

Two US officials confirmed to ABC News that Israeli weapons hit a site in Iran as tensions hit boiling point in the Middle East.

Three drones "have been successfully shot down by the country's air defence, there are no reports of a missile attack for now," Iran's National Cyberspace Center spokesman, Hossein Dalirian, said on X.

Just hours before the explosions were heard, Iranian Foreign Minister Hossein Amir-Abdollahian told CNN that Iran's response if Israel took any further military action against it would be "immediate and at a maximum level".

"In case the Israeli regime embarks on adventurism again and takes action against the interests of Iran, the next response from us will be immediate and at a maximum level," Amir-Abdollahian said.

It comes after Iran launched a drone attack on Israel which the UK helped intercept. Israel had told the US on Thursday it would be retaliating against Iran in the coming days, a senior US official said, stating: "We didn't endorse the response."

Footage filmed by locals in Isfahan appears to show missiles lighting up the sky. This morning, Iran has denied reports of an attack.

Hossein Dalirian wrote: "There has been no air attack from outside borders to Isfahan or other parts of the country."

He said Israel had "only made a failed and humiliating attempt to fly quadcopters [drones] and the quadcopters have also been shot down."

Iranian state media said air defence systems were activated in several areas overnight to engage possible targets, but there were no direct explosions.