WASHINGTON >> Russia continued to push out disinformation to undermine faith in the U.S. election Tuesday, but American officials said they were bracing for an even bigger assault of false narratives in the days and weeks after the vote.

CIA officials called out a video circulating Tuesday that falsely claimed the spy agency had uncovered cases of fraud in which dead people had voted.

“A fabricated video claiming the CIA identified deceased Americans allegedly voting is absolutely false and is consistent with foreign disinformation that the U.S. intelligence community has long warned about,” said Ryan Miller, a spokesperson for the CIA.

Another disinformation campaign targeted the FBI, prompting the bureau to say its name and logo were being used to spread election falsehoods. One video falsely claimed that the FBI was warning of a terrorist threat to a polling site.

The video involving the CIA used clunky English syntax but had high production values. It was similar to disinformation about the Paris Olympics spread by a Russian group known as Storm-1679 this summer, according to outside experts. U.S. officials confirmed that the video circulating Tuesday was of Russian origin.

In briefings Tuesday morning and at midday, federal officials said that they had not tracked any national-level threats to the vote, but that intelligence agencies had been warning about an increase in disinformation.

Officials said the gravest threats would come in the next few days, as foreign adversaries are likely to stoke doubts about the results or anger over any contested races.

On Monday night, the Cybersecurity and Infrastructure Security Agency, the FBI and intelligence agencies issued an unusual warning that adversaries, led by Russia, were conducting additional influence operations.

On Tuesday, Cait Conley, a senior official with the cybersecurity agency, said she expected an increase in the “scope and scale” of the influence efforts.

“Adversaries have taken lessons learned from previous cycles to understand which narratives would be most effective,” she said.

In the second of several briefings scheduled Tuesday, Conley said the foreign adversaries had two goals: undermining confidence in the vote and sowing partisan discord among Americans. And she said foreign countries were trying to hide their hand as they pushed the false narratives.

“We should expect to see narratives around those types of objectives, both today and in the days to come,” she said.

The federal officials provided few details on reports of local disruptions, urging the public to listen to local and state officials.

With all of the noise and disinformation out there, what Americans need to “really realize is that your state and local election official is the signal through that noise; that is your source for authoritative information on election security,” she said.

Federal officials have tried to quickly call out foreign influence campaigns and singled out Russian efforts to spread false information about destroyed ballots in Pennsylvania, illegal voting in Georgia and voter fraud in Arizona.

Earlier Tuesday, Conley said the foreign influence efforts had been focused on swing states. Court documents released this fall detailed a Russian plan that concentrated on swing states in order to boost the chances of former President Donald Trump.

While Russia favors Trump, Iran has been supportive of Vice President Kamala Harris, according to intelligence officials. A U.S. official said Tuesday that U.S. intelligence and law enforcement agencies had tracked Iranian activity in recent days but that Iran had been less active than Russia.