* Iranian missile attacks cause extensive damage to

Qatar's LNG facilities

* Trump warns of massive response if Iran attacks Qatari

LNG again

* UAE shuts gas facilities after intercepting missiles,

no injuries reported

* Qatar expels Iranian attaches, condemns attack as

national security threat

(Adds Shell statement in paragraph 5, Trump comment in

paragraph 10, background details of new attack on Qatar in

paragraph 7)

By Yomna Ehab and Jaidaa Taha

March 18 (Reuters) - Qatar's state oil giant QatarEnergy

said on Wednesday that Iranian missile attacks on Ras Laffan,

the site of the country's core LNG processing operations, caused

"extensive damage", while the UAE shut gas facilities after

intercepting missiles early on Thursday.

The attacks, which drew a furious response from U.S. President

Donald Trump, came hours after Iran issued evacuation warnings

for several oil facilities across Saudi Arabia, the UAE and

Qatar, following strikes on its own energy infrastructure in

South Pars and Asaluyeh.

QatarEnergy, the world's second-largest LNG exporter, said in a

statement that its emergency response team was deployed

immediately to contain fires caused by the attack. No casualties

were reported and all personnel were accounted for, it added.

Ras Laffan, located 80 km (50 miles) north of Doha, is an

energy-industry hub and hosts several international companies

including Shell, the world's biggest LNG trader.

"We are currently assessing any potential impact on any

asset operated or utilised by Shell in Ras Laffan Industrial

City and will provide further information in due course," a

Shell spokesperson said.

The energy major has a 30% stake in a 7.8

million-metric-tons-a-year LNG facility and investments in

yet-to-produce LNG plants at Ras Laffan. It also has a 100%

interest in the Pearl gas-to-liquids plant in the hub, with

capacity to process up to 1.6 billion cubic feet per day of

wellhead gas.

QatarEnergy said the Pearl gas-to-liquids facility had

suffered extensive damage. Several LNG facilities were hit by

missile attacks in the early hours of Thursday, causing

"sizeable fires" and further damage, it added.

TRUMP THREATENS RESPONSE

Qatar produces 77 million metric tons of LNG annually and

is the world's second-largest exporter of the fuel used in power

generation and industries. The Laffan refinery primarily

processes condensate into refined products including aviation

fuel.

In a statement on social media, Trump warned Iran not to

attack Qatari LNG facilities again and threatened to "massively

blow up the entirety of the South Pars Gas Field" if it did so.

He said Israel had attacked South Pars without informing Qatar

or the United States.

Qatar's foreign ministry told Iran's security and military

attaches to leave the country within 24 hours and declared them

"persona non grata".

In a statement, the ministry condemned the attack on Ras Laffan

as a "direct threat" to Qatar's national security and accused

Iran of taking an "irresponsible approach."

Saul Kavonic, head of research at Australia's MST Marquee,

said attacks on Ras Laffan "could cause a lasting global gas

shortage, but this won't pressure the Trump administration

because the U.S. benefits economically from high global gas

prices".

GAS FACILITIES SHUT DOWN IN UAE

In the UAE, authorities said they were responding to

incidents at the Habshan gas facilities and at the Bab oil field

caused by falling debris from intercepted missiles.

The gas facilities were shut down and no injuries were

reported, the Abu Dhabi Media Office said.

The Habshan complex, operated by Abu Dhabi state oil giant

ADNOC, is one of the world's largest gas processing facilities,

comprising five plants with a total capacity of 6.1 billion

standard cubic feet per day (bscfd), according to ADNOC.