US President Donald Trump said the ceasefire with Iran was " over" Wednesday but left the door open to more talks, after fighting flared sparked by Iranian attacks on ships in the vital Strait of Hormuz.

Renewed hostilities between the US and Iran have also heightened safety and security concerns around the Strait of Hormuz.

Washington launched strikes on the Islamic Republic overnight in response to ships being hit in the Strait of Hormuz. Iran retaliated by targeting US bases in the Gulf.