Russia's efforts to hack the US electoral system last year were more extensive than previously made public, Bloomberg reported Tuesday.
Voting systems were hacked in 39 states during the 2016 presidential election, sources told Bloomberg. That figure is nearly double the number previously reported.
The information comes just days after a leaked widespread cyberattacks on more than 100 local governments and a voting software firm leading up to the 2016 election.revealed
The FBI did not immediately respond to CNET's request for comment.