Attacks on the Ras Laffan and other energy in the facilities were behind a surge in Brent oil by more than 10 percent at one point to over $119 a barrel, before paring gains.

Here is a look at some of the key energy facilities that have been targeted in the US-Israel war with Iran.

- Ras Laffan -

Ras Laffan in Qatar is the world's largest liquefied natural gas (LNG) hub.

It has been repeatedly targeted by Iranian strikes and has now suffered "extensive damage, state-run QatarEnergy said.

Early Thursday, QatarEnergy reported "sizeable fires" and significant damage at several LNG facilities. The interior ministry later said all fires had been contained.

That came after an earlier attack on the Ras Laffan Industrial City on Wednesday had already caused extensive damage to a gas-to-liquids facility.

Qatar shares the world's largest natural gas reservoir with Iran.

QatarEnergy estimates the Gulf state's portion of the reservoir holds about 10 percent of the world's known natural gas reserves.

- South Pars -

Iran's strikes on Ras Laffan come after its South Pars gas field was hit on Wednesday, sparking a fire.

The South Pars/North Dome mega-field is the largest known gas reserve in the world and is shared by Iran and Qatar.

Around 70 percent of Iran's domestic natural gas comes from its portion.

The attack was condemned by some of Iran's Gulf neighbours, including Qatar and the United Arab Emirates whose energy facilities have come under repeated Iranian attack.

US President Donald Trump said Thursday that Israel had staged the strike and Washington "knew nothing" about it.

But he warned that if Iran continued attacks against Qatar, US forces would "massively blow up the entirety" of the South Pars field.

- Kharg -

Kharg island, around 30 kilometres off Iran's mainland, is a hub for roughly 90 percent of the country's crude oil exports.

It was hit in US strikes on Saturday, but Iranian officials said exports were continuing normally and there had been no casualties.

Trump had threatened to target the island's oil infrastructure if Iran continues to block the Strait of Hormuz, a crucial passage for energy and other exports from the region.

- Ruwais refinery -

The Ruwais oil refinery, in the emirate of Abu Dhabi, is the world's fourth largest single-site refinery, according to state-owned operator Adnoc.

Operations there were halted as a "precaution" after a drone attack on the industrial complex housing the facility, a source told AFP.

The source did not say whether the refinery had been hit. Adnoc did not make an official announcement.

- Ras Tanura -

The Ras Tanura facility along Saudi Arabia's eastern Gulf coast is home to one of the largest refineries in the Middle East and a cornerstone of the kingdom's energy sector.

The complex has a capacity of 550,000 barrels per day.

It has been repeatedly targeted in Iranian strikes, including a drone attack that caused a fire and forced a partial shutdown of the refinery.

Bloomberg, citing an unnamed source, said Wednesday that operations had resumed.

The output of oil and oil products of Gulf countries, excluding Oman, has plunged from 30 million barrels per day last year to 20 million currently, according to the International Energy Agency.

The president of Aramco, which operates the Ras Tanura refinery, has warned the war could have "catastrophic consequences" on oil markets.

- Yanbu -

The Red Sea port of Yanbu is the destination of Petroline, the overland oil pipeline that gives Saudi Arabia an export alternative to the Strait of Hormuz -- currently choked off by Iran.

Saudi Arabia's defence ministry said Thursday a drone crashed into the Samref refinery in the industrial zone in the port of Yanbu, adding that damage assessment was underway.

Saudi Arabia's Samref refinery can process about 400,000 barrels of crude per day.

- Mina Abdullah oil refinery -

The Mina Abdullah refinery, one of three oil refineries operated by the state Kuwait National Petroleum Company was struck by a drone on Thursday and caught fire.

The company later said the fire was contained at the facility capable of processing 454,000 barrels per day.

- Mina Al-Ahmadi -

The Mina Al-Ahmadi oil refinery, located near the Mina Abdullah refinery, was also hit by a drone and caught fire on Thursday.

The state Kuwait National Petroleum Company later said the fire was contained at the facility with a capacity of processing 346,000 barrels per day.

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