President Donald Trump has said the US will "obliterate" Iranian power plants if the Strait of Hormuz is not open before a 48-hour deadline.
Iran’s blockade and attacks on ships in the Strait has seen oil prices soar over recent weeks.
Iran warns it will retaliate against all US-linked energy infrastructure in the Middle East if its power plants are attacked.
Meanwhile, Israel has said it launched a wave of strikes on the Iranian capital overnight.
An Iranian missile strike hit two southern Israeli towns close to a nuclear facility on Saturday.
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