The East-West crude oil pipeline in Saudi Arabia is offline after multiple drone attacks launched from Iraq. Shutting down a pipeline means stopping the flow of oil through that route. Iran-allied Houthi militants in Yemen have escalated their strikes against Saudi Arabia this week, and the drone attacks are part of that campaign.
Saudi authorities shut down the East-West line in response to the strikes. The pipeline carries crude oil across Saudi Arabia. The Houthi movement, backed by Iran and based in Yemen, has widened its campaign against the kingdom this week. The drones that triggered the closure came from Iraq.