AP Photo/Nati Harnik
The emails of more than 100 Democratic lawmakers and groups were reportedly compromised in the breach that US officials say was carried out by Russian hackers, according to a The New York Times reported on Wednesday.
The Times says the FBI is expanding its investigation as a result, noting that the hacking primarily targeted Democratic Party insiders and Hillary Clinton's campaign officials.
The Democratic Governors' Association is among the groups that were reportedly targeted.
It's unclear how the FBI's investigation will evolve amid the new findings.
Early fallout from the cyberattack rocked the party ahead of the Democratic National Convention in July. It led to the resignation of Committee Chair Debbie Wasserman Schultz after hacked internal emails revealed suggestions that the party favored Hillary Clinton over Bernie Sanders in the Democratic primary.
In the meanwhile, the party has been bracing for the possibility of another damaging leak before November.