The US has recovered most of the $4.4m (£3.1m) ransom paid to a cyber-criminal gang responsible for taking the Colonial Pipeline offline last month.
DarkSide – which US authorities said operates from eastern Europe and possibly Russia – infiltrated the pipeline last month.
The attack disrupted supplies for several days causing fuel shortages.
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According to the firm, the pipeline carries 45% of the East Coast’s supply of diesel, petrol and jet fuel.
On Monday, Deputy Attorney-General Lisa Monaco said investigators had “found and recaptured” 63.7 Bitcoin worth $2.3m – “the majority” of the ransom paid. Since the ransom was paid the value of Bitcoin has fallen sharply.