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

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.

The FBI says Russian actors may have been behind dozens of false bomb threats targeting voting centres in swing states.