It is unknown how much money the hackers are seeking, and Colonial has not commented on whether it would pay.
“Cyber attacks on our nation’s infrastructure are growing more sophisticated, frequent and aggressive,” Brandon Wales, acting director of the Cybersecurity and Infrastructure Security Agency (CISA), said on Tuesday at a Senate hearing on the SolarWinds hack that hit companies and government agencies.
Government steps in to help ease crisis
The Environmental Protection Agency issued a waiver on Tuesday that allows distributors to continue supplying winter fuel blends through May 18 in three Mid-Atlantic states to help ease supplies.
North Carolina and the US Department of Transportation, meanwhile, relaxed fuel-driver rules, allowing truckers hauling petrol to work longer hours.
There are growing concerns that the pipeline outage could lead to further price spikes ahead of the Memorial Day weekend at the end of this month.
The weekend is the traditional start of the busy summer driving season.