Potential evidence of Russian hacking has been found at an electric utility in Vermont.
The state-run Burlington Electric Department said it discovered a malware code on one of its laptops, though it was not connected to the company's grid systems.
Federal officials were notified immediately and the computer was isolated.
The U.S. government said the code is used by a Russian hacking operation known as Grizzly Steppe.
The same operation has been linked to hacks during the U.S. presidential election.
Russia has been accused of meddling in our democratic process by hacking political sites and email accounts, including those of the Democratic National Committee. Moscow has denied carrying out the cyberattacks.
In retaliation, President Obama issued sanctions on the country and expelled 35 of its intelligence officials from Washington.
Russian President Vladimir Putin said Friday that he will not expel American diplomats from his country, and will wait to try and resume relations with the U.S. when President-elect Donald Trump is sworn into office next month.
Trump praised Putin's decision on Twitter on Friday.