The Colonial Pipeline pipeline could be restored to normal service by the end of the week, the company said Monday, four days after it was hit by a cyberattack.

The company said it was restarting operations incrementally in a “phased approach” to the Colonial Pipeline, a 5,500-mile artery from Houston to the doorstep of New York City that is responsible for nearly half of the East Coast’s fuel supply, including gasoline, diesel, and jet fuel.