WikiLeaks founder Julian Assange’s belongings will be seized by Ecuadorian officials and handed to US prosecutors. Picture: AP Photo/Matt Dunham, File

WikiLeaks founder Julian Assange’s belongings will be seized by Ecuadorian officials and handed to US prosecutors. Picture: AP Photo/Matt Dunham, File

Julian Assange's belongings from his time living in the Ecuadorian embassy in London will be handed over to United States prosecutors on Monday, according to WikiLeaks.

Ecuadorian officials are travelling to London to allow US prosecutors to "help themselves" to items including legal papers, medical records and electronic equipment, it has been claimed.

WikiLeaks founder Julian Assange looks out from the balcony at the Ecuadorian embassy where his possessions will be seized by prosecutors. Picture: AP Photo/Frank Augstein

WikiLeaks says United Nations officials and Assange's lawyers are not allowed to be present.

Lawyers say it is an illegal seizure of property, which has been requested by the US authorities. The material is said to include two of Assange's manuscripts.

The Australian was dragged out of the embassy last month and is serving a 50-week prison sentence for bail violations.

He faces an extradition request from the US next month.

Kristinn Hrafnsson, Editor-in-chief of WikiLeaks and barrister Jennifer Robinson (R) address the media outside Westminster Magistrate Court in London Picture: AP Photo/Frank Augstein

"On Monday, Ecuador will perform a puppet show at the embassy of Ecuador in London for their masters in Washington, just in time to expand their extradition case before the UK deadline on 14 June. The Trump administration is inducing its allies to behave like it's the Wild West," said Kristinn Hrafnsson, editor in chief of WikiLeaks, on Sunday.

Baltasar Garzon, international legal co-ordinator for the defence of Assange and WikiLeaks, has urged international bodies to intervene in what he called "an unprecedented attack on the rights of the defence, freedom of expression and access to information".

"It is extremely worrying that Ecuador has proceeded with the search and seizure of property, documents, information and other material belonging to the defence of Julian Assange, which Ecuador arbitrarily confiscated, so that these can be handed over to the agent of political persecution against him, the United States," Mr Garzon said.