The FBI is investigating a cyberattack against another U.S. Democratic Party group that may be related to an earlier hack against the Democratic National Committee, four people familiar with the matter told Reuters.
The previously unreported incident at the Democratic Congressional Campaign Committee, or DCCC, and its potential ties to Russian hackers are likely to heighten accusations, so far unproven, that Moscow is trying to meddle in the U.S. presidential election campaign to help Republican nominee Donald Trump.
Hacking of the party's emails caused discord among Democrats at the party's convention in Philadelphia to nominate Hillary Clinton as its presidential candidate.