US election LIVE updates: Joe Biden defeats Donald Trump to become 46th President of the United States

Our US correspondent Matthew Knott has this report: Joe Biden wins US presidency after defeating Trump in Pennsylvania.

Networks and media outlets, including The Associated Press, called the result for Biden and Harris within minutes. Fox News was the last in line to declare the result.

Harris, who appears to have been out exercising at the time of the announcement, tweeted this video of herself sharing the news with Biden.

Biden will address the nation around midday AEDT.

Trump was golfing when the news broke. He issued an angry statement, refusing to concede and vowing to take the outcome to court.

However, his refusal to accept the result mattered little to Biden's supporters – there was jubilation in the streets. From New York to Philadelphia to Chicago, people celebrated at the prospect of having a new president.

Barack Obama led congratulations but warned of the challenges Biden faces after he is inaugurated in January, and urged Americans to give his former vice-president a chance to do their part to overcome the partisanship that has torn America apart.

Hillary Clinton said America had turned a new page, and that the result was a "repudiation of Trump".

Around the world, leaders issued their congratulations.

And that's it from me. It's been an incredible night and wonderful to share it with you. I'm handing over to Megan Levy who will keep you updated with developments throughout this extraordinary day.

Before I sign off, a quick shout-out to Megan and Lyn Eyb, without whom this blog would not happen.