U.S. President Donald Trump on Sunday appeared to extend by 24 hours his deadline for Iran to make a deal to reopen the Strait of Hormuz or face devastating infrastructure attacks.

U.S. President Donald Trump said that "many" of Iran's military leaders were killed in a huge strike on the Islamic republic's capital.

Over the last ten days the U.S. and Iran have held indirect negotiations through Pakistan, Egypt and Turkey to try and reach a deal of a ceasefire in return for opening the strait of Hormuz. No significant progress has been achieved so far, U.S. news portal Axios reported on Saturday.

U.S. President Donald Trump on Saturday reminded Iran of the 10-day ultimatum he had issued for it to accept a deal that would stop the war.

"Remember when I gave Iran ten days to MAKE A DEAL or OPEN UP THE HORMUZ STRAIT. Time is running out - 48 hours before all Hell will reign down on them," Trump said in a post on the Truth Social platform.

Mediators from Pakistan, Turkey and Egypt are still working on a ceasefire plan between the U.S. and Iran, the Israeli Public Broadcasting Corporation reported on Saturday.

A second Turkish-flagged ship has crossed the war-torn Strait of Hormuz, Turkey's Transport Minister Abdulkadir Uraloglu said Saturday.

Iranian and American forces raced each other Saturday to recover a crew member of the first U.S. fighter jet to go down inside Iran since the start of the war.

A U.S. fighter jet was shot down in Iran on Friday and one crew member was rescued, officials said, the first aircraft downed since the war began nearly five weeks ago.

It marked a major escalation in the conflict just two days after President Donald Trump said in a national address that the U.S. has "beaten and completely decimated Iran" and was "going to finish the job, and we're going to finish it very fast."

Iran’s Foreign Minister Abbas Araghchi said Thursday evening that striking civilian infrastructure “only conveys the defeat and moral collapse of an enemy in disarray.”

Israel said Friday it was under attack from a new barrage of Iranian missiles, as President Donald Trump warned the United States had yet to begin "destroying what's left" with more of the Islamic republic's infrastructure in his sights.