The US military said it took out multiple Iranian vessels on Tuesday as the Islamic Republic vowed to block the region's oil exports and concerns grew about the country's threats to stop tankers from using a waterway through which 20 per cent of the world's oil is shipped.The US destroyed 16 mine-laying Iranian vessels, though President Donald Trump said in social media posts that there were no reports of Iran planting explosives in the Strait of Hormuz.

The American military released the figure, along with unclassified footage of some of the vessels, after Trump earlier warned Iran against laying mines in the strait.

Both sides sharpened their rhetoric as the war entered its 11th day, with Trump threatening to hit Iran at "a level never seen before" if the country failed to immediately remove any mines it might have deployed in the channel.

US Defence Secretary Pete Hegseth promised the most intense strikes yet, while the Pentagon detailed the broader toll of injuries sustained by US troops.

The conflict's effects rippled across the Middle East and beyond. Iranian leaders ruled out talks, threatened Trump and launched new attacks against Israel and Gulf Arab countries.

In Iran, residents of Tehran said they experienced some of the war's heaviest strikes. A woman said she saw a residential building get hit. She and others reached by The Associated Press spoke on condition of anonymity to prevent reprisals. Tens of thousands of Iranians have sought shelter in the countryside.