Colonial Pipeline said on Saturday that its pipeline system has returned to "normal operations" after a crippling cyberattack forced a six-day shutdown in the USA. "Since this incident began, we have been clear that our focus was on the safe and efficient restoration of service to our pipeline system," the company said on Twitter. It had launched an initial restart on Wednesday following the shutdown triggered by the ransomware attack. READ MORE: Vehicles line up to get fuel at a Sunoco gas station in Sumter, South Carolina.(Bloomberg) Last week's complete shutdown of the crucial pipeline led to panic-buying and widespread gas station outages in the Southeast and prompted oil industry executives to warn that gas hoarding was worsening the supply crunch.