Almost 3,000 US troops will be sent to the Middle East after an American rocket killed an Iranian military chief, Washington has said.

It comes after Iran has warned of "harsh retaliation" following a US airstrike that killed Tehran's top general, Qassem Soleimani.

On Friday leaders of both Iran and the United States fired rhetoric at one another, with an adviser to Tehran stating: "Trump, through his gamble, has dragged the US into the most dangerous situation in the region."

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