Iran's supreme leader Ayatollah Ali Khamenei warned Monday of a forceful retaliation if the United States or its allies bomb the Islamic republic, following a threat by President Donald Trump.

"They threaten to do mischief," Khamenei said of Trump's latest threat, during a speech on Eid al-Fitr, the holiday marking the end of the Muslim fasting month of Ramadan.

"If it is carried out, they will definitely receive a strong counterattack."

In an interview on Saturday, Trump said "there will be bombing" if Iran does not agree to a deal to curb its nuclear programme.

"If they don't make a deal, there will be bombing," he said, according to NBC News, which said he also threatened to punish Iran with what he called "secondary tariffs".

It was not clear whether Trump was threatening bombing by US planes alone or perhaps in an operation coordinated with another country, possibly........

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