Supporters of WikiLeaks founder Julian Assange formed a human chain outside Britain's parliament on Saturday to demand an end to an attempt by the United States to have him extradited to face criminal charges.

Hundreds of protesters, including Jeremy Corbyn, the former leader of Britain's opposition Labour Party, gathered in a line that stretched from parliament's perimeter railings and snaked across nearby Westminster Bridge to the other side of the River Thames.

Stella Assange, who is married to the Australian-born activist, said the British government should speak to authorities in the United States to end the extradition bid which was launched in 2019.

"It's already gone on for three-and-a-half years. It is a stain on the United Kingdom and is a stain on the Biden administration," she said.

Assange supporters in the UK

Supporters of WikiLeaks founder Julian Assange create a human chain outside Houses of Parliament during a protest, in London, Britain October 8, 2022. (credit: REUTERS/HENRY NICHOLLS)
Supporters of WikiLeaks founder Julian Assange create a human chain outside Houses of Parliament during a protest, in London, Britain October 8, 2022. (credit: REUTERS/HENRY NICHOLLS)
Supporters of Assange were also due to protest on Saturday outside the US Department of Justice in Washington.

Assange, 51, is wanted by US authorities on 18 counts, including a spying charge, relating to WikiLeaks' release of confidential US military records and diplomatic cables.

Washington says he put lives in danger. His supporters say he has been victimized because he exposed US wrongdoing in conflicts in Afghanistan and Iraq.

Assange's legal team has lodged an appeal at Britain's High Court against London's decision to extradite him.