Trump paired his Friday ultimatum with a social media post saying the US had "totally obliterated" military targets on the island, the export terminal for 90 per cent of Iran's oil shipments, which lies about 500km northwest of the strait.
US strikes did not target Kharg's oil infrastructure, but "should Iran, or anyone else, do anything to interfere with the Free and Safe Passage of Ships through the Strait of Hormuz, I will immediately reconsider this decision", Trump wrote.
Iran, however, showed no sign of capitulating or bowing to US-Israeli military pressure.
Iran's armed forces responded to the Kharg attack by saying any strike on their country's oil and energy infrastructure would lead to strikes on facilities owned by oil companies co-operating with the United States in the region, Iranian media reported.
Iran's semi-official Fars news agency reported, citing sources, that more than 15 explosions were heard on the island during the US attacks.
The sources said air defences, a naval base and airport facilities were hit, but there was no damage to oil infrastructure.
Markets were watching for any sign that US strikes had damaged the island's network of pipelines, terminals and storage tanks, with even minor disruptions able to further tighten global supply and add pressure to a volatile market.
Iran could not defend against US attacks and "would be wise to lay down their arms, and save what's left of their country," he posted on his Truth Social platform.
Trump told reporters on Friday the US Navy would soon start escorting tankers through the Strait of Hormuz, a conduit for 20 per cent of the world's fossil energy supplies.
As the war entered its third week, Iran, however, has shown no sign of capitulating or bowing to US-Israeli military pressure.
Iranian Supreme Leader Mojtaba Khamenei, who replaced his slain father, has said the strategic waterway should remain closed as a tool of pressure.
Iran's armed forces responded to the Kharg attack by saying any strike on their country's oil and energy infrastructure would lead to strikes on facilities owned by oil companies co-operating with the United States in the region, Iranian media reported.
Iran's semi-official Fars news agency reported, citing sources, that more than 15 explosions were heard on the island during the US attacks.
The sources said air defences, a naval base and airport facilities were hit, but there was no damage to oil infrastructure.
Much of the oil shipped from Iran via Kharg goes to China, the top global crude importer.
Markets were watching for any sign that US strikes had damaged the island's intricate network of pipelines, terminals and storage tanks.
Even minor disruptions could further tighten global supply, adding pressure to a volatile market.
Iran also claimed success in shooting down five drones over its airspace, bringing to 114 the total US and Israeli drones it has downed during the war, Iranian state TV reported on Saturday.
Oil prices have swung sharply on Trump's changing comments about the likely duration of the war, which began with massive US and Israeli bombardments of Iran and quickly spread into a regional conflict with broad consequences for worldwide energy and stock markets.
The US embassy in the Iraqi capital Baghdad was hit in a missile attack on Saturday, causing smoke to rise from the building, Iraqi security sources said.
In other attacks across the region, Iran's Revolutionary Guards said they had carried out additional attacks on Israel with Lebanon's Hezbollah militia, Iran's Tasnim news agency reported.
Some oil loading operations in the port of UAE's Fujairah, outside the Strait of Hormuz, have been suspended after a drone attack and fire on Saturday morning, Bloomberg News reported.
At least 12 medical personnel were killed in an Israeli strike on a healthcare centre in the town of Borj Qalaouiya in southern Lebanon, the Lebanese state news agency reported on Saturday, citing the health ministry.
Reports from Iranian media said at least 12 people were killed and several others wounded in attacks on multiple locations across Iran, including central and southeastern provinces.
In Khomein, southwest of Tehran, a projectile struck a rural home in the village of Khizab, killing six people and wounding seven others, according to the security deputy of the provincial governor quoted by Tasnim news agency.
After two weeks of war, 2000 people have been killed, mostly in Iran but many in Lebanon and a growing number in the Gulf.
US forces have suffered casualties, including the deaths of all six crew members aboard a refuelling aircraft that crashed in western Iraq.
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