Mysterious robocalls - but no evidence of U.S. election hacking

FILE PHOTO: Acting Secretary of Homeland Security Chad Wolf is seen before he testifies before the Senate Homeland Security and Governmental Affairs Committee during his confirmation hearing on Capitol Hill in Washington, U.S., September 23, 2020. Greg Nash/Pool via REUTERS/File Photo

WASHINGTON (Reuters) - Voters in several U.S. states have received mysterious robocalls urging them to stay home on Election Day, according to state and party officials.

But midday Eastern time - with more than half the expected number of American ballots already cast - there was little sign of digital interference long dreaded by those charged with keeping the vote safe.