Colonial Pipeline halts operations after cyberattack; largest refined products pipeline in US Colonial Pipeline is the largest refined products pipeline in the US, transporting more than 100 million gallons of fuel daily to meet the energy needs of consumers from Houston, Texas to the New York Harbor. On 7 May, the Colonial Pipeline Company learned it was the victim of a cyberattack involving ransomware. In response, the company took certain systems offline to contain the threat; this has temporarily halted all pipeline operations. Colonial Pipeline is 5500 miles in length, and links refineries on the Gulf Coast to the eastern and southern US. The pipeline supplies nearly half of the US East Coast’s fuel supply; a prolonged outage could spike gasoline prices just as the summer driving season is approaching.