Saudi Arabia’s crucial East-West oil pipeline was reportedly targeted in an attack by Iran just hours after a ceasefire aimed at halting regional hostilities was agreed, an industry source told Reuters on Wednesday. The pipeline, the kingdom’s only current outlet for crude oil exports, was hit alongside other facilities in the country, raising concerns about the stability of global energy supplies.

The East-West Pipeline, which carries around 7 million barrels per day (bpd) from Saudi Arabia’s oil-rich eastern provinces to the Red Sea port of Yanbu, has become a lifeline for exports since Iran effectively blocked the Strait of Hormuz. The strait’s closure has trapped massive volumes of oil and gas in the Gulf, driving prices sharply higher.

“Flows through the pipeline are expected to be affected,” the source said, noting that damage assessments were underway. Analysts warn that any prolonged disruption could worsen what has been described as the world’s most severe energy crisis.

Iran’s Islamic Revolutionary Guard Corps (IRGC) confirmed in a statement on Wednesday that it had launched multiple missile and drone attacks across the region, including on what it described as oil facilities belonging to U.S. companies in Yanbu. The timing, extent of the damage, and operational impact on the pipeline remain unclear.

Saudi Arabia’s government communications office and state oil giant Saudi Aramco did not immediately respond to requests for comment.

The strikes follow a ceasefire agreement brokered by Pakistan on Tuesday, intended to halt a six-week conflict that has already killed thousands, destabilized parts of the Middle East, and triggered widespread disruptions in global energy markets. Despite the ceasefire, attacks on other Gulf nations have continued.

Kuwait reported an intensified wave of Iranian strikes since 8:00 a.m. local time (0500 GMT), with drones causing extensive damage to oil facilities, power plants, and desalination plants. The United Arab Emirates and Bahrain also reported missile and drone attacks, with Bahrain noting damage to residential areas in Sitra.

Aramco typically uses roughly 2 million bpd of the East-West Pipeline’s capacity domestically, leaving about 5 million bpd for exports. Shipments from Yanbu averaged near full capacity at approximately 4.6 million bpd in the week beginning March 23, according to shipping data. The pipeline had allowed Saudi Arabia to maintain strong oil proceeds despite the Strait of Hormuz closure, with March revenues estimated to exceed levels from the previous year.