U.S. intelligence agencies have concluded that Russia is behind two new fabricated videos that appeared on social media this week falsely claiming that Haitians illegally voted in Georgia and that Vice President Kamala Harris and her husband received a $500,000 bribe from the performer Sean Combs.

The U.S. government issued a new warning about the fabrications on Friday, a week after blaming Russia for another video that falsely claimed that ballots in Pennsylvania were being destroyed.

Officials say foreign powers are working to undermine faith in the election, and government agencies in charge of protecting the vote next Tuesday have said the current torrent of false claims is greater than before. A senior official from the Cybersecurity and Infrastructure Security Agency called it a “fire hose of disinformation.”

The agency, along with the Office of the Director of National Intelligence and the F.B.I., released a statement on Friday attributing both videos to Russia’s efforts to sway voters in the election and inflame partisan divisions.