Divided America watches thriller election

A winner did not emerge after midnight on Tuesday, amid a knife-edge highly-contested US election, with Joe Biden saying he believes he is on track to win, while political pundits say that Donald Trump could still turn things around.

Presidential candidate Joe Biden, who was the former Vice President under the Obama administration, was ahead in electoral votes on Tuesday night against incumbent Donald Trump.

Trump and Biden are slugging out a tight battle for the White House across the country with signs that a momentous election could come down to Arizona, Pennsylvania, Wisconsin and Michigan.

But in some states, Pennsylvania, Wisconsin and Michigan, a number of days could be necessary before declaring a winner.

Biden, who was the first candidate to speak to supporters after midnight Tuesday, said "we believe we're on track to win this election."

"Keep the faith guys, we're going to win this," Biden said.

Trump followed Biden's statement with a tweet of his own, claiming to be "up BIG" and promising to make a statement later in the night.

“I will be making a statement tonight. A big WIN!” Trump wrote.

In an earlier tweet, which was flagged by Twitter, Trump wrote "We are up BIG, but they are trying to STEAL the Election. We will never let them do it. Votes cannot be cast after the Polls are closed!" 

Twitter flagged the President's tweet, saying "some or all of the content shared in this Tweet is disputed and might be misleading about how to participate in an election or another civic process."

Check live results here.