US officials continue to say that at least some of the bomb threats made to polling locations in multiple states appeared to originate from Russian email domains. But the investigation is ongoing, and the FBI has yet to publicly confirm that someone in Russia was behind the threats.

“The FBI said in their statement it looks like these threats came from .ru domains,” Jen Easterly, the head of the US Cybersecurity and Infrastructure Security Agency, told reporters Tuesday night.

“I don’t necessarily think that that means they were Russian. I think that is still being investigated.”

“If, in fact, it is definitively linked to a foreign adversary, or Russia, I think we would think through what the implications are as a whole of government,” Easterly said.

The FBI is working with local law enforcement and officials in four states who have received bomb threats to polling and election related locations, a law enforcement official told CNN Tuesday night.

The states that have received these threats — Michigan, Wisconsin, Arizona and Georgia —evacuated polling places in the wake of the threats, some of which the FBI previously confirmed originated from Russian email domains and deemed non-credible.

/CNN