US President Donald Trump repeated his threat to strike Iranian infrastructure hard if Tehran does not open the Strait of Hormuz, using explosive language hours after announcing that US forces rescued the missing crew member from a downed F-15 fighter jet.

The Iranian military has warned of new attacks across the Middle East and urged civilians in the region to avoid areas near US forces, as President Donald Trump extended the deadline for Tehran to open the key Strait of Hormuz.

President Donald Trump says Iranian negotiators should "get serious soon" on talks with the United States to end the war "before it is too late," as deadline he set looms for Tehran to open the crucial Strait of Hormuz.

US President Donald Trump postponed threatened attacks on Iranian power plants for a second time, apparently giving Tehran 10 more days to open the Strait of Hormuz to shipping, and said talks on ending the war were going "very well."