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Colonial Pipeline said Monday afternoon that parts of its system are being brought back online, with the aim of restoring service by the end of the week.

“Segments of our pipeline are being brought back online in a stepwise fashion, in compliance with relevant federal regulations and in close consultation with the Department of Energy, which is leading and coordinating the Federal Government’s response,” the company said in a statement.

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The firm that the situation “remains fluid and continues to evolve,” and that it’s following an incremental process that will return sections to service based on a phased approach.

“This plan is based on a number of factors with safety and compliance driving our operational decisions, and the goal of substantially restoring operational service by the end of the week,” the company said.

Colonial Pipeline, which operates the largest pipeline carrying fuel from the Gulf Coast to the Northeast, “halted all pipeline operations” on Friday night as a proactive measure following a ransomware cyberattack. A criminal group criminal group known as Dark Side was responsible for the attack, the FBI confirmed.

The company said Sunday evening that some of its smaller lateral lines between terminals were once again online, but that its main lines were still shut down.

The pipeline is a critical part of U.S. petroleum infrastructure, transporting around 2.5 million barrels per day of gasoline, diesel fuel, heating oil and jet fuel. The pipeline encompasses more than 5,500 miles and carries nearly half of the East Coast’s fuel supply. The system also provides fuel for airports, including in Atlanta and Baltimore.