US President Donald Trump has published an expletive-laden post on social media, in which he threatened to destroy Iran's power plants and bridges if it failed to meet his Tuesday deadline to reopen the Strait of Hormuz to all shipping.
He repeated an earlier threat to unleash "hell" but told US media there was a "good chance" of a deal being reached with Tehran.
Iran mocked his ultimatum, dismissing it as "helpless, nervous and stupid".
Trump's new threat came after he announced that the second crew member of a US fighter jet downed over Iran had been successfully rescued in an operation deep inside hostile territory.
Following the downing of the F15 aircraft on Friday, both the pilot and the second crew member ejected - with the pilot recovered shortly afterwards.
