U.S. spy agencies are tracking a Russian hacking attack against a Ukrainian gas company linked to the impeachment of President Donald Trump, including whether it was done to find damaging information on former Vice President Joe Biden's family, according to a senior U.S. official.

The U.S. is reviewing evidence of the hack at Burisma Holdings first disclosed by researchers at security company Area 1, according to Shelby Pierson, the election threats executive for the Office of the Director of National Intelligence, Bloomberg reported.

Read alsoReuters: Russian hackers targeted Ukrainian company at center of impeachment storm

Видео дня

When asked whether there are concerns the attack by Russian intelligence was done to find derogatory information on Biden which could then be used to undermine his presidential campaign, Pierson said intelligence officials are examining that possibility. The vice president's son, Hunter, was once on the company's board.

"We try to keep a very open mind as to why intelligence services would be pursuing this information which could of course include the scenarios that you outlined," Pierson said Tuesday on the sidelines of an election security conference in Washington.

"Before we even jump to a conclusion of intent we're always looking for what are those compromises," she said. "Let's just not forget that some of this can be for reconnaissance purposes or for other applications that have nothing to do with a messaging campaign."

Pierson later said in an interview with MSNBC that "we've long talked about the Russians as a threat so we certainly are tracking that."