
Saudi Arabia has temporarily closed its critical East-West oil pipeline, a 1,200km (746-mile) conduit stretching across the Arabian Peninsula, after it was attacked by drones on Friday.
The drones were reported to have been launched from Iraq, where an investigation is under way. No group has claimed responsibility for the strikes so far.
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Plumes of smoke from a section of the pipeline could be seen on video footage from the area. It is understood that equipment used to operate the pipeline was also hit.
The closure of the pipeline has halted the flow of Saudi oil exports, which have also been disrupted by the closure of the Strait of Hormuz since March. A critical artery for the kingdomâÂÂs energy exports, it has become all the more important due to the US-Israel war on Iran.
The closure of its pipeline comes as Saudi Arabia is drawn into a new front in the Middle East conflict in Yemen, where Houthi forces have made rapid advances along the coast against the Saudi-backed Yemeni government and seized the strategic island of Mayun in the Bab al-Mandeb strait.
HereâÂÂs what we know about the closure of SaudiâÂÂs East-West pipeline and what it means for global energy security:
What has Saudi Arabia announced?
Saudi ArabiaâÂÂs Ministry of Foreign Affairs on Friday said the East-West oil pipeline, which crosses the country from SaudiâÂÂs Abqaiq oilfield in the east to the Yanbu port on the Red Sea in the west, had been hit in the Riyadh and Medina areas by drones, causing injuries and damage.
The pipeline, which is operated by the majority state-owned Saudi Aramco, has been temporarily shut as a âÂÂprecautionâÂÂ, according to the countryâÂÂs Ministry of Energy. Specialised teams have begun steps to âÂÂsecure the pipeline and assess its safetyâÂÂ, the ministry said.
Where did the drone attack come from and who launched it?
The attack originated in the southeastern Iraqi province of Maysan, according to the office of Iraqi Prime Minister Ali al-Zaidi.
No group has claimed responsibility for the attack, and neither Saudi Arabia nor the Iraqi government have publicly identified a group they suspect of being behind it.
Iraq is home to numerous Iran-backed armed groups, however.
Wolfgang Pusztai, a security policy and defence analyst, told Al Jazeera that the drone strikes on Saudi ArabiaâÂÂs oil pipeline had most likely been carried out by one of these groups.
âÂÂI believe this [attack] was most likely an order from Tehran. From TehranâÂÂs point of view, this is them supporting YemenâÂÂs Houthi war objective, which is for Saudi Arabia to withdraw from Yemen,â he said.
Iran-backed groups are calculating that the more pressure Saudi Arabia feels from attacks on its territory, the more likely it is to withdraw from Yemen, where the Houthi rebels fighting the internationally recognised government are backed by Iran, said Pusztai.
âÂÂOn the other side, this certainly sharpens IranâÂÂs own blockade over the Strait of Hormuz because Tehran does not allow Saudi Arabia to bypass the Strait of Hormuz any more. This signals to Saudi Arabia â and probably to the other Gulf states â that Iran canâÂÂt be trusted.âÂÂ
How has Iraq responded?
The Iraqi government formally condemned the attack, saying it does not accept its territory being used as a âÂÂlaunchpad for attacks against any nationâ and that it would take âÂÂlegal action against anyone proven to be involvedâÂÂ.
IraqâÂÂs prime minister has ordered a probe into the Maysan operations command, which oversees security in the province Baghdad says the attack came from, and has dismissed its commander.
Iraq has also ordered the closure of the Shalamcheh border crossing between Iraq and Iran as a precautionary measure, two security sources told Reuters on Saturday.

Will Saudi Arabia respond?
So far, Saudi Arabia has opted not to retaliate. In a statement, the Saudi Ministry of Foreign Affairs said it would hold off on responding âÂÂat this stageâ at the request of the Iraqi prime minister.
However, Riyadh said it reserves the right to âÂÂtake â all measures necessaryâ to protect its interests.
In July, the United States and Saudi Arabia launched joint attacks on the Iran-backed Popular Mobilisation Forces (PMF) in Iraq, killing at least 20 members of the group, after Saudi Arabia claimed it launched drone attacks on its oil facilities.
IraqâÂÂs National Security Council, chaired by Prime Minister Ali al-Zaidi, called the attacks on the PMF bases in seven Iraqi provinces âÂÂa flagrant violation of IraqâÂÂs sovereignty and the sanctity of its landsâÂÂ.
Abdulaziz Alghashian, a senior nonresident fellow at the Gulf International Forum think tank, said Saudi Arabia, which recently signed a defence pact with Turkiye and Pakistan, is likely to eventually retaliate, possibly in coordination with other regional allies.
Alghashian told Al Jazeera that he would not expect much from the Saudi-Turkiye-Pakistan Mecca defence pact announced in August, for now, as it is âÂÂstill under constructionâÂÂ, but that there could still be some form of âÂÂmultilateral responseâÂÂ.
âÂÂI think weâÂÂre going to see more escalation in the region and more military confrontation,â said Alghashian. âÂÂThe question is just the extent of itâÂÂ.
How significant is the closure of this pipeline?
Extremely.
The East-West pipeline has â been moving four million to five million barrels of oil per day (bpd) in recent months, amounting to 4 to 5 percent of global supply, according to data cited by Reuters. It had increased capacity specifically to help mitigate the disruption to Saudi oil exports in the Strait of Hormuz.
While oil exports remain far below normal in the conflict-hit Strait of Hormuz, the closure of the East-West pipeline is expected to create more pain for global energy, as US diesel prices hit an all-time high and Brent crude oil â the global benchmark â currently costs more than $104 per barrel, say analysts.
Before the US-Israeli war on Iran commenced on February 28, Brent crude was trading at about $72 per barrel. Early in the conflict, it hit a high of $119.
âÂÂThis is a real blow,â Ben Cahill, a senior fellow at the Atlantic Council Global Energy Center, told Al Jazeera, referring to the pipeline as Saudi ArabiaâÂÂs âÂÂprincipal bypass option to avoid the Strait of HormuzâÂÂ.
âÂÂThe key buffers that got us through the last six months have basically been worn away,â he said.
Saudi political analyst Khalid Bartafi told Al Jazeera that the attacks on the pipeline could cause a crisis for the global community.
âÂÂItâÂÂs going to be very dire consequences because we are talking about five million barrels of oil for export disappearing from the market,â he said. âÂÂThe next 48 will tell you whether this is going to remain some sort of contained incident or this is going to become yet another major regional escalation.âÂÂ
He added: âÂÂThis is not just our problem, itâÂÂs a global problem because if Iran could close both the Strait of Hormuz and Bab al-Mandeb the world will pay. The world community needs to do something.âÂÂ

How quickly can the pipeline be reopened?
It is hard to tell.
After a pumping station on the same pipeline was struck in April, causing output to fall to 700,000bpd, Saudi Arabia announced it had been repaired and restored to full capacity just three days later.
However, Saudi Arabia has not provided details on the extent of the damage from the latest attack. Satellite images showed smoke emerging from an area of the pipeline south of Medina. NASA also detected unusual thermal activity in the area.

What other options does Saudi Arabia have for its oil exports?
None that can readily compensate for the loss of the pipeline.
With exports hugely restricted in the Strait of Hormuz, the East-West pipeline had served as Saudi ArabiaâÂÂs main bypass route, bringing crude oil from eastern Saudi Arabia westward to the Red Sea port of Yanbu.
That means Saudi Arabia cannot simply redirect the same eastern crude to Yanbu while the pipeline is shut. Meanwhile, it can try to make greater use of existing stocks in the west, but the Houthisâ newfound control of YemenâÂÂs Red Sea coast and Mayun island, also known as Perim island, in the Bab al-Mandeb strait could pose further challenges to getting that oil out â even if longer journeys around South AfricaâÂÂs Cape of Good Hope are viable.
As a result, Saudi Arabia will likely reroute more exports through Egypt via the Suez Canal or the Sumed pipeline, a 320km (199-mile) pipeline carrying crude oil from the Red Sea to the Mediterranean Sea.
Cahill added that the closure of the East-West pipeline could have ripple effects across an already squeezed global energy market.
âÂÂThereâÂÂs less slack in the system, everything is running hot,â said Cahill. If attacks continue and there is âÂÂany real threat that the Red Sea is going to be cut off for some timeâÂÂ, he added, it would mean further upward pressure on prices.
