Donald Trump has ordered a fresh wave of ballistic missile strikes against Iran after US embassies across the Middle East issued new security warnings to Americans in the region.

Around a dozen strikes targeted Iranian radar systems and military assets along a 300-mile stretch of the coast of the Strait of Hormuz on Tuesday.

Iranian state media reported strikes on the country's oil-rich Qeshm Island located. Explosions were also reported in the southern port cities of Bandar Abbas and Chabahar. 

Iran retaliated with the Islamic Revolutionary Guard Corps claiming that it had launched d a ballistic missile strike on Camp Titin, a US Marine base in Jordan. There was no immediate confirmation from the Pentagon.

The latest exchange comes after Iranian strikes over the weekend on US bases in Jordan, with US Central Command stating it is 'hitting back hard' against the regime. 

Trump also warned Iran against responding to the latest attack: 'If the failed Nation of Iran retaliates for this very justified attack, they will be hit again at a much harder and higher level, but it will not be the biggest attack of them all, that is waiting in the wings and, when it is over, there will be very little left of the Islamic Republic of Iran!'

Earlier, US embassies in Qatar, Israel, and Jordan sent out a warning that tensions in the region create a complex security environment with the potential for sudden escalation.

'Americans currently in the Middle East should exercise heightened vigilance and be aware of potential flight cancellations, airspace closures, and travel disruptions,' the diplomatic warning reads.

Iran's Islamic Revolutionary Guard Corps, the regime's hardline military force, attacked two commercial vessels attempting to transit the strait late Monday night. 

The latest strikes come despite Trump repeatedly claiming Iran's military had been destroyed and the war was over, raising questions about why the US is still targeting its radar and military assets months later.

With military tensions escalating after months of standoff, Brent crude climbed 4 percent to $94 a barrel on Tuesday afternoon.