The UK has issued a warning call after Israel launched a revenge attack against Iran - with explosions rocking the country which closed its airspace following the strikes. A US official confirmed to ABC News that Israeli weapons hit a site in Iran as tensions hit boiling point in the Middle East.

       Iran fired air defence batteries early on Friday morning across several provinces and Hossein Dalirian, a spokesman for Iran's civilian space program, tweeted that several small" "quadcopter" drones had been shot down.

       Mel Stride, the work and pensions secretary, told Sky News that both sides need to step back from the brink, with de-escalation "absolutely key".

       The semi-official Fars news agency reported on the sound of explosions over Isfahan, the country's third-largest city, near its international airport.

       "The city of Ghahjaworstan is located near Isfahan Airport and the eighth hunting base of the Army Air Force," FARS news said.

       Isfahan, which is 350 kilometers (215 miles) south of Iran's capital, Tehran, is home to a major airbase for the Iranian military as well as sites associated with its nuclear program.

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