US President Donald Trump said an angry Israel "violently lashed out" and attacked Iran's major gas field, a significant escalation in the US-Israeli war, but ruled out further such attacks by Israel unless Iran retaliated.
The attack on the huge South Pars gas field drove oil prices higher and prompted a threat by Iran to attack oil and gas targets across the Gulf, while it fired missiles at Qatar and Saudi Arabia.
The escalation heightens the unprecedented disruption of global energy supplies that has raised the political stakes for Mr Trump, who joined Israel in attacking Iran nearly four weeks ago.
Qatar's state oil giant Qatar Energy reported "extensive damage" after Iranian missiles hit the Ras Laffan Industrial City that processes about a fifth of global gas supply.
Watch: Israeli strike ignites large fire at Iran's South Pars gas field
Saudi Arabia said it intercepted and destroyed four ballistic missiles launched toward Riyadh and an attempted drone attack on a gas facility in its east.
Iran again targeted Qatar's gas facilities and its missiles also targeted the Saudi capital.
Qatar Energy "sizeable fires" and extensive damage at several of its liquefied natural gas (LNG) facilities targeted in missile attacks this morning.
Mr Trump said the United States did not have advance knowledge of Israel's attack, adding that Qatar had not been involved.
"Israel, out of anger for what has taken place in the Middle East, has violently lashed out at a major facility known as South Pars Gas Field in Iran," Mr Trump posted on X.
"Unfortunately, Iran did not know this, or any of the pertinent facts pertaining to the South Pars attack, unjustifiably and unfairly attacked a portion of Qatar's LNG Gas facility.
"NO MORE ATTACKS WILL BE MADE BY ISRAEL pertaining to this extremely important and valuable South Pars Field unless Iran unwisely decides to attack a very innocent, in this case, Qatar," Mr Trump added.
"In which instance the United States of America, with or without the help or consent of Israel, will massively blow up the entirety of the South Pars Gas Field at an amount of strength and power that Iran has never seen or witnessed before."
Earlier, the Wall Street Journal said Mr Trump had approved of Israel's plan to attack Iran's natural gas field.
South Pars is the Iranian sector of the world's largest natural gas deposit, which Iran shares with Qatar, a close US ally and host of the United States' biggest military base in the Gulf.
Since the start of the conflict, Tehran has targeted not just Israel, but US diplomatic and military facilities across the Gulf and warned its neighbours not to host attacks on Iran.
With de-escalation nowhere in sight, Mr Trump is considering sending thousands more US troops to the Middle East, according to a US official and three people familiar with the planning.
Those troops could be used to restore the safe passage of oil tankers through the Strait of Hormuz, a choke point for a fifth of the world's oil trade.
Iran missile fire kills 3 Palestinians in West Bank, foreign worker in Israel
Iranian missile attacks have killed three Palestinian women in the occupied West Bank and a foreign worker in central Israel, medics said.
Falling shrapnel struck a hair salon in the West Bank town of Beit Awa near Hebron, killing the three women, according to the Palestine Red Crescent Society, marking the first Palestinian deaths from Iranian attacks in the ongoing Middle East war.
The Red Crescent said at least eight others were injured, including one woman in critical condition.
A short while later, Israeli medics said Iranian missile fire had killed a man in central Israel, bringing the death toll in Israel from attacks during the ongoing war to 15.
Israel's Magen David Adom medical emergency service described the victim as a "foreign worker", with Israeli media reports saying he was a Thai national working in agriculture.
He was killed in Moshav Adanim, a town about 20km northeast of Tel Aviv and less than 8km from the West Bank, according to the medical service.
A statement from Magen David Adom quoted its medic Idan Shina as saying "metal shrapnel was scattered across the scene", where the man was found dead with "severe shrapnel injuries".
'Unprovoked'
The Israeli military earlier said it had identified a round of missile fire from Iran, which it was "operating to intercept".
Since that attack, the military reported several more waves of Iranian attacks, triggering air raid alerts across parts of central and northern Israel as well as in settlements in the West Bank.
Iran's Revolutionary Guards said they had launched missiles and drones at targets across Israel, according to a statement carried by Iranian news agencies Fars and ISNA.
Iran and Israel have previously accused each other of using cluster bombs.
Islamic foreign ministers condemn Iran attacks
The foreign ministers of six Islamic states meeting in Riyadh denounced Iran's strikes on Gulf neighbours and called for an immediate halt.
Iran's targeting of residential areas and civilian infrastructure, such as oil facilities, airports and desalination plants, could not be justified under any circumstances, the ministers said in a statement.
"This pressure from Iran will backfire politically and morally and certainly we reserve the right to take military actions, if deemed necessary," Saudi Foreign Minister Prince Faisal bin Farhan told a press conference after the diplomats met in Riyadh.
Interceptors were seen fired from near the Riyadh hotel where the conference was held around the time the ministers gathered for the consultative meeting on the Iran war.
The UAE shut down its Habshan gas facility after it intercepted missiles fired in what its foreign ministry called a" terrorist attack" by Iran.
More than 3,000 people have been killed in Iran since the US-Israeli attacks began on February 28, the US-based Iran human rights group HRANA estimates.
Authorities in Lebanon said 900 have been killed there and 800,000 forced to flee their homes.
Iranian attacks have killed people in Iraq and across the Gulf states, and at least 13 US military service members have been killed in the war.
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