Gas stations along the U.S. East Coast are beginning to run out of fuel as North America’s biggest petroleum pipeline races to recover froma paralyzing cyberattack that has kept it shut for three days.

A small group of private-sector companies, with help from several U.S. agencies, disrupted ongoing cyber-attacks against Colonial Pipeline Co. and more than two dozen other victims, according to people with knowledge of the matter.

A group that sought records related to the U.S. citizenship status of voters in North Carolina won its bid to revive claims brought under federal election law.

The attack that hit Colonial Pipeline last week is a novel form of cybercrime that puts normally staid corporate entities in the vise of an old-school extortion scheme, one in which a company’s balance sheet, insurance status and capacity to absorb the pain of a lengthy operational shutdown may all come into play.

The closing of the nation’s biggest fuel pipeline system at the hands of hackers illustrates how at risk the infrastructure is to cyberattacks, Energy Secretary Jennifer Granholm said Monday.

The Federal Bureau of Investigation attributed the massive Colonial Pipeline breach to ransomware created by a relatively new gang called DarkSide on Monday as new details emerged about the group accused of carrying out the attack.