Donald Trump insisted the US bombed a top Iran general to "stop a war" - as the US fears revenge attacks in major cities.

The president ordered the hit on Qasem Soleimani - said to be Iran's second most powerful figure - after claims he was plotting against American diplomats in Iraq.

But there are serious concerns the execution could cause the outbreak of World War Three after Iran's supreme leader Ali Khamenei promised "harsh vengeance", "jihad" and "crushing revenge".

Trump tonight tried restore calm as he spoke on camera for the first time since giving the airstrike order.

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