The narrow waterway, conduit for around one-fifth of global oil and liquefied natural gas supplies, has been effectively closed to most shipping since the US and Israel launched the war against Iran almost three weeks ago.
Vital energy infrastructure in both Iran and neighbouring Gulf states has also been attacked, and oil prices have jumped about 50 per cent since the start of the war on February 28, threatening a global economic shock.
In an effort to increase supply and lower prices, the Trump administration said it would waive sanctions on Iran to allow the sale of 140 million barrels of oil that has been stranded on tankers since the war began. The administration had previously eased sanctions on a similar amount of Russian oil as well.
More than 2000 people have been killed, mostly in Iran and Lebanon, while Americans appear increasingly concerned at signs the war could expand further.
A new Reuters/Ipsos poll showed almost two-thirds of Americans believe Trump will order troops into a large-scale ground war, with only seven per cent supporting such a move.
On Friday, Israel's military said it carried out two large waves of air strikes on Tehran and central Iran, targeting weapons production facilities and sites storing ballistic missile launchers and components. Israel faced multiple waves of missile attacks from Iran, according to the Israeli military, triggering air raid sirens in Tel Aviv and Jerusalem, where explosions from interceptions were heard.
Fragments from an Iranian missile struck Jerusalem on Friday, landing just outside the Old City, which is sacred to Christians, Jews and Muslims, police said, releasing a photograph of the debris. There were no reports of injuries or casualties.
Kuwait's state oil firm said its Mina Al-Ahmadi refinery had suffered multiple drone attacks that set some units alight, the latest energy facility hit by Iran in recent days.
Three US officials told Reuters that 2500 Marines, along with the USS Boxer, an amphibious assault ship, and accompanying warships would deploy to the region, although they did not say what their role would be.
Two officials said there had been no decision on whether to send troops into Iran itself. Sources have earlier told Reuters that possible targets could include Iran's coast or Kharg Island oil export hub.
Trump said the US was close to reaching its goals in the war, which include degrading Iran's military and preventing it from developing a nuclear weapon, and may wind down its military effort.
Trump also called US allies "cowards" for declining to help open the Strait of Hormuz while fighting continued in a conflict they were not consulted about beforehand.
Several allies have pledged to join "appropriate efforts" to ensure safe passage through the strait, but Germany and France have both said fighting must stop first. German Chancellor Friedrich Merz said he would speak to Trump this weekend.
The UK government authorised the US to use its bases in Britain to strike Iranian missile sites that are targeting ships in the strait.
As Muslims around the region tried to celebrate Eid al-Fitr, which ends the fasting month of Ramadan, and Iranians marked Nowruz, the Persian New Year, new Iranian Supreme Leader Mojtaba Khamenei issued a message of defiance.
Khamenei, who has not been seen in public since the Israeli attack that killed his father and predecessor Ayatollah Ali Khamenei on the war's first day, said Iranians had responded with unity and resistance and "dealt a disorienting blow to the enemy".
A US intelligence official, speaking on condition of anonymity, said the statement raises questions about Khamenei's condition, as his father traditionally marked the New Year with a video address.
The official said Khamenei's extended absence raises questions about his condition and who is running the country.
with AP
