Results from Iowa’s caucuses, the first vote in the race to pick a Democratic White House candidate to face President Donald Trump, have been plunged into chaos by apparent technology issues.
The state’s Democratic party said it had found “inconsistencies”.
But they stressed the unprecedented holdup was a “reporting issue” and a “hack or an intrusion”.
Voters flocked to over 1,600 schools, libraries and churches across 99 counties on Monday to pick candidates.
The candidates are vying to win the opening contest of the 2020 White House campaign and become the Democratic nominee who will challenge Mr Trump, a Republican, in the 3 November election.
The front-runners among the 11 remaining contenders are Vermont Senator Bernie Sanders, former US Vice-President Joe Biden, Pete Buttigieg, the former mayor of South Bend, Indiana, Massachusetts Senator Elizabeth Warren and Minnesota Senator Amy Klobuchar.
Amid the delay, party officials held a call with the rival campaigns