A day after Americans voted in a bitterly contested election, the rest of the world was none the wiser on Wednesday, with millions of votes still to count, the race too close to call and a mounting risk of days or even weeks of legal uncertainty.

Donald Trump's pre-emptive declaration of victory at the White House was condemned by some U.S. political commentators and civil rights groups, who warned about the trampling of long-standing democratic norms.

Most world leaders and foreign ministers sat on their hands, trying not to add any fuel to the electoral fire.