* Trump warns Iran not to attack neighbours over Israel's

South Pars strike

* Iran strikes hit Qatar gas facilities, target Riyadh

* Islamic foreign ministers condemn Iran attacks on

neighbours

* Trump considering sending more troops to Middle East

By Andrew Mills and Timour Azhari

DOHA/RIYADH, March 19 (Reuters) - U.S. President Donald

Trump said an angry Israel "violently lashed out" and attacked

Iran's major gas field, a significant escalation in the

U.S.-Israeli war, but ruled out further such attacks by Israel

unless Iran retaliated.

Wednesday's 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

Trump, who joined Israel in attacking Iran nearly four weeks

ago.

Qatar's state oil giant QatarEnergy reported "extensive

damage" after Iranian missiles hit the Ras Laffan Industrial

City that processes about a fifth of global gas supply.

Saudi Arabia said it intercepted and destroyed four

ballistic missiles launched toward Riyadh on Wednesday and an

attempted drone attack on a gas facility in its east.

On Thursday, Iran again targeted Qatar's gas facilities and

its missiles also targeted the Saudi capital.

QatarEnergy "sizeable fires" and extensive damage at several

of its liquefied natural gas (LNG) facilities targeted in

missile attacks early on Thursday.

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," Trump posted on X on Wednesday.

"Unfortunately, Iran did not know this, or any of the

pertinent facts pertaining to the South Pars attack, and

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.

"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 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 U.S.

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 U.S. diplomatic and military facilities across

the Gulf and warned its neighbours not to host attacks on Iran.

With de-escalation nowhere in sight, Trump is considering

sending thousands more U.S. troops to the Middle East, according

to a U.S. official and three people familiar with the planning.

Those troops could be used restore the safe passage of oil

tankers through the Strait of Hormuz, a chokepoint for a fifth

of the world's oil trade.

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

U.S.-Israeli attacks began on February 28, the U.S.-based Iran

human rights group HRANA estimates.

Authorities in Lebanon say 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 U.S. military service members have

been killed in the war.