The Democratic Party isn’t yet out of the hacking woods.
Guccifer 2.0, the self-proclaimed hacker who recently passed stolen emails from Democratic Party officials to open-information site WikiLeaks, has turned over more party documents for publication, the Wall Street Journal is reporting. The content of the new documents is unknown as is any date of publication.
But if they’re anything like the earlier batch, it won’t be good for the Democratic Party.
On Friday, Guccifer 2.0 published a spreadsheet online showing the personal phone numbers and email address of nearly 200 current and former House Democrats, as well as top party officials. According to the Journal, which cited anonymous sources, prominent Democrats including House Minority Leader Nancy Pelosi spent the weekend changing their cellphone numbers, attempting to learn more about the hacking, and trying to figure out whether other hackings may be coming.
Get Data Sheet, Fortune’s technology newsletter.
The data leak was part of a broader string of attacks on Democrats that hit a crescendo ahead of the party’s Democratic National Convention last month. Stolen documents published online by WikiLeaks included several emails between top Democratic Party officials that showed them discussing how to undermine Sen. Bernie Sanders’ presidential primary campaign against Hillary Clinton. The revelation ultimately prompted the resignation of former party chairwoman Debbie Wasserman Schultz and elicited widespread outcry and protests by Sanders supporters.
Soon after the attack, the Clinton campaign said that the hack was linked to Russia and that it was attempting to sway public opinion and ultimately help Republican nominee Donald Trump.
While the U.S. government hasn’t formally blamed the hacking on Russia, the Wall Street Journal’s sources say that at least some congressional Democrats believe Russia was indeed responsible and that it hoped to impact the next federal elections. The Journal’s sources added that U.S. law enforcement officials are currently considering whether to charge the Russian government with the latest hackings, although no decision has been made.
For more about hackers, watch:
Ultimately, it’s unknown what’s next and how the Russians would respond to any formal claims they were behind attacks on the Democrats. But at least according to the Journal‘s sources, whoever was behind the attacks is far from done.