The Biden administration is working with pipeline companies to strengthen protections against cyberattacks following the Colonial Pipeline hack, with announcements of actions planned in coming days, the Department of Homeland Security (DHS) said on May 25.

A ransomware attack forced Colonial Pipeline, which runs from Texas to New Jersey, to shut much of its network for several days this month, leaving thousands of gas stations across the U.S. Southeast without fuel. Motorists fearing prolonged shortages raced to fill their tanks as the outage laid bare the nation's reliance on a few key pipelines for fuel needs.

The Transportation Security Administration (TSA), a unit of the DHS, “is coordinating with companies in the pipeline sector to ensure they are taking all necessary steps to increase their resilience to cyber threats and secure their systems,” the agency said.

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The TSA is collaborating with another branch of DHS, the Cybersecurity and Infrastructure Security Agency. DHS said it will release more details “in the days ahead,” without providing particulars.

The closure of the 5,500-mile (8,900-km) system was the most disruptive cyberattack on record, preventing millions of barrels of gasoline, diesel and jet fuel from flowing to the East Coast from the Gulf Coast.

The Washington Post reported that DHS is preparing to issue its first mandatory cybersecurity regulations on pipelines, citing senior officials.

In the past TSA has provided voluntary guidelines on cybersecurity for pipelines. The agency only had six full-time employees in its pipeline security branch through 2018, which limited reviews of cybersecurity practices, a General Accountability Office report said in 2019. The TSA said this month it has since expanded that staff to 34 positions.

The TSA would require pipeline companies to report cyber incidents to the federal government, senior DHS officials told the Post. New rules will require companies to correct any problems and address shortcomings or face fines, the article said.

Retail U.S. gasoline prices surged to a seven-year high after the outage. Prices remain elevated from prior to the hack, but have slowly declined from the peak reached just as the line was reopened.

The new regulations were discussed after DHS Secretary Alejandro Mayorkas and other top officials considered how they could use existing TSA powers to bring change to the industry, the Post said.

Representative Bennie Thompson, chair of the Homeland Security Committee in the House of Representatives, called the move “a major step in the right direction towards ensuring that pipeline operators are taking cybersecurity seriously and reporting any incidents immediately.”

Editor’s note: Story updated at 10:30 a.m. CT May 26 to correct previous reporting that incorrectly stated Colonial’s network had been down for 11 days.

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