Officials in at least two states — Maine and Georgia — said that they had responded to threats against schools and polling places and that none were found to be credible.

In Fulton County, Georgia, five bomb threats that were determined to be “noncredible” prompted two polling locations in Union City, Georgia, to close briefly, the county elections director, Nadine Williams, said at a news conference. Williams said the county was asking a court to keep the two locations open for an extra half-hour.

Brad Raffensperger, the Georgia secretary of state, said at a separate news conference that officials had “identified the source, and it was from Russia.” The FBI also referred to bomb threats deemed not to be credible in several states, “many of which appear to originate from Russian email domains.”

A spokesperson for Raffensperger’s office, Mike Hassinger, said in a text message that “the source of the threats is being investigated.” He added, “It’s unconfirmed. Looks like Russia, but could also be somebody spoofing Russia.”

— The Associated Press