First published on Dive Brief: Colonial Pipeline, the largest refined products pipeline in the U.S. and a major supplier of gasoline and jet fuel to the East Coast and a number of southern states, shut down after a ransomware attack Friday, the company said in a statement Saturday. Colonial Pipeline retained FireEye/Mandiant to manage the investigation, according to a spokesperson from the cybersecurity company. DarkSide ransomware is responsible for the compromise, the FBI confirmed in a statement to Cybersecurity Dive Monday. By Sunday, the company restored some smaller, lateral lines between terminals and delivery points, but the main lines remained shut off. Colonial Pipeline is in the process of restoring service to other laterals, but will only restore service when authorities deem it safe.