Saudi Arabia temporarily shut a 1,200-kilometer oil pipeline carrying roughly 4 million to 5 million barrels a day after multiple drone attacks, putting a route equal to about 4% to 5% of global supply out of operation at the center of an expanding regional conflict, Reuters reported. The kingdom said on Friday that the drones were launched from Iraq and struck the East-West Pipeline in the Riyadh and Medina regions, causing injuries and damage that officials were still assessing. Saudi Arabia did not identify the attackers, and Iraq condemned the strikes.

The closure matters because the pipeline, also known as Petroline, has become Saudi Arabia’s principal way to bypass the Strait of Hormuz, where traffic has been severely constrained during the six-month U.S.-Iran war. The line carries crude from the Abqaiq processing center near the Persian Gulf to the Red Sea port of Yanbu. In recent months, it has functioned less as backup infrastructure than as the central artery keeping Saudi exports connected to world markets.

The attack coincided with a second escalation at the other end of that route. Yemen’s Iran-aligned Houthi forces seized Perim Island and reached Dhubab, positions astride the Bab el-Mandeb Strait at the southern entrance to the Red Sea, according to Reuters. Together, the pipeline shutdown and Houthi advance threatened both the land corridor that avoids Hormuz and the maritime exit used by tankers loading at Yanbu.

Oil prices slipped on Friday but remained on course to finish above $100 a barrel for the first week since May. The immediate effect on Saudi exports was unclear, and a temporary shutdown does not establish that millions of barrels have been permanently lost. Yet the disruption arrived when inventories were falling, Gulf output was already depressed and the market had fewer alternative routes than it did before the war.

A Bypass Becomes a Chokepoint

The East-West Pipeline was designed to reduce Saudi dependence on Hormuz, the narrow channel between Iran and Oman through which about one-fifth of global petroleum consumption moved before the current war. Saudi Aramco has described the line as capable of moving as much as 7 million barrels a day after a 2019 conversion expanded its capacity. In first-quarter results published in May, Aramco said it had sharply ramped the system to that maximum as exports shifted west.

That flexibility has limits. U.S. Energy Information Administration analysis found that Saudi and Emirati pipelines together could provide about 4.7 million barrels a day of capacity to bypass Hormuz under disruption conditions. But the figure represented available alternatives before the present conflict transformed the Saudi line into heavily used infrastructure. Once the bypass itself is attacked, spare capacity on paper offers less reassurance.

Saudi officials said they closed the line as a precaution after strikes at more than one location. The government reserved the right to protect its interests but held off retaliation after a request from Iraqi Prime Minister Mohammed Shia al-Sudani, according to the kingdom’s account reported by Reuters. Iraq dismissed a regional military commander, began a broad security operation and closed the Shalamcheh border crossing with Iran while investigating the attacks.

Two Maritime Gateways Under Pressure

The pipeline ends at Yanbu on the Red Sea, so its strategic value depends on tankers being able to sail south through Bab el-Mandeb. The strait is just 18 miles wide at its narrowest point and is divided by Perim, also known as Mayun. Control of the island and nearby Dhubab gives the Houthis a position immediately beside the two shipping channels, though territorial control does not by itself prove that the group can close the waterway.

The scale of the exposure is significant. About 4.2 million barrels a day of crude and petroleum products crossed Bab el-Mandeb in the first half of 2025, down from 9.3 million in 2023 after earlier Houthi attacks forced rerouting, according to EIA data. More recent commercial tracking cited in a Reuters explainer estimated June volumes at about 7% of global oil output, reflecting the route’s renewed importance during the Hormuz disruption.

The Houthis say navigation remains safe for vessels other than Saudi ships covered by a blockade they declared in July. That is a claim by a combatant, not a guarantee to shipowners or crews. The International Maritime Organization has repeatedly condemned attacks on commercial vessels and stressed regional cooperation; its current updates describe continuing uncertainty for seafarers and renewed security risks across the Red Sea, Gulf of Aden and Hormuz.

A Tight Market Has Less Room for Error

The pipeline attack landed on the same day that the International Energy Agency documented how much capacity the market had already lost. Global oil production fell 1.6 million barrels a day in August to 100.1 million, while more than 10 million barrels a day of Gulf output remained shut in. Saudi crude supply fell from 8.24 million barrels a day in July to 5.97 million in August, the agency’s September report said.

Inventories have absorbed much of the shock, but that cushion is eroding. Observed global stocks fell by 95 million barrels in August and by 507 million barrels between the start of the war and the end of that month, according to the IEA. North Sea Dated crude averaged $91 in August before reaching $113.48 on September 9, while U.S. diesel prices climbed above the equivalent of $200 a barrel as refinery and shipping constraints tightened supplies of middle distillates.

Those numbers explain why a precautionary closure can move risk assessments even before the loss of exports is measured. A pipeline can sometimes restart quickly after inspection or isolated repairs, and Saudi Arabia maintains domestic and overseas storage. But oil markets price the probability of continued interruption as well as barrels already missing. Multiple strike sites, an unknown attacker and an active front near the Red Sea outlet increase uncertainty across each link in the export chain.

Shipping Costs Carry the Shock Further

If Red Sea risks rise further, vessels can divert around southern Africa, but the detour is costly. A Shanghai-to-Rotterdam trip around the Cape of Good Hope adds about 12 days and acts like roughly a 30% increase in transit time, according to UNCTAD. During the 2024 disruption, the agency estimated that longer routes reduced effective global container capacity by about 9% and raised fuel use, congestion and freight rates.

Those effects extend beyond crude buyers. Ships carry refined fuels, food, manufactured goods and industrial inputs through the same corridor. UNCTAD’s 2025 maritime review found that rerouting had already made freight rates more volatile and increased emissions, while developing economies were especially exposed to higher transport costs. Another sustained diversion would meet a shipping system already shaped by years of route changes.

The human stakes are also distinct from the market arithmetic. The AP reported that escalating violence in Yemen had displaced more than 46,000 people in a week, while the prospect of a government counteroffensive raised fears of renewed full-scale civil war. That humanitarian danger is not reducible to a change in the oil price, even though the same military geography drives both.

Attribution and Duration Will Determine the Next Risk

Saudi Arabia’s decision not to retaliate immediately created space for Iraq to investigate, but it did not resolve attribution. Iranian-backed armed groups operate in Iraq, and the Houthis receive support from Tehran, yet neither fact proves who ordered or executed the pipeline attacks. Iran denies directing the Houthis, and no group had credibly claimed the Saudi strikes when officials announced the closure.

Three developments will determine whether the episode remains a short operational disruption or becomes a deeper energy shock: how quickly Saudi engineers restore the pipeline, whether Houthi forces consolidate control around Perim and Dhubab, and whether Iraq can identify and restrain the launch network. A Saudi-backed Yemeni counteroffensive could reopen territory, but it could also intensify fighting around the strait and expose more civilian communities.

What is established is narrower but consequential. The war has placed both major maritime exits from the Arabian Peninsula under pressure, and the infrastructure built to bypass one is now vulnerable on the approach to the other. Until the pipeline returns to service and the Bab el-Mandeb position stabilizes, the world’s largest oil exporter has less redundancy precisely when global inventories and alternative Gulf flows are at their weakest.