As millions of voters cast their ballots for the White House and members of Congress on Tuesday, officials across the country are rapidly grappling with bomb threats and disinformation campaigns that officials said were aimed at undermining trust in the election.

And the FBI warned that faked video clips were circulating on the internet telling Americans to “vote remotely” because of a terrorist threat.

Hoax bomb threats, many of which appeared to originate from Russian email domains, were directed on Tuesday at polling locations in five battleground states — Georgia, Michigan, Arizona, Wisconsin and Pennsylvania — as Election Day voting was underway,