BP announced Monday that it has partially restored a segment of the Olympic Pipeline System east of Everett, Washington, following an unplanned release of refined petroleum products over the weekend.

The BP-operated Olympic Pipeline shut down its operations in the affected area on Sunday after the discharge was discovered. BP’s pipeline system in the area comprises two distinct pipelines, allowing each pipeline to operate independently.

According to the company, it successfully restored the pipeline segment unimpacted by the issue on Sunday, allowing product delivery to resume on that line.

However, the specific nature and volume of the refined products released, which include key transportation fuels like gasoline and diesel, were not immediately disclosed.

The 400-mile Olympic Pipeline system is a crucial piece of regional infrastructure, moving fuels from Northern Washington south to Oregon. It also provides essential jet fuel to Seattle-Tacoma International Airport (Sea-Tac).

Despite the pipeline incident, a Sea-Tac spokesperson confirmed that airport operations were not impacted and that a sufficient on-hand fuel reserve was maintained to manage such situations.

BP stated that investigations are underway to determine the cause of the release, without providing an estimated timeline for the full restoration of the affected pipeline segment.