Julian Assange’s belongings from his time living in the Ecuadorian embassy in London will be seized by US prosecutors in the UK on Monday, according to WikiLeaks.

Ecuadorian officials are travelling to London to allow US prosecutors to “help themselves” to items at the embassy – including legal papers, medical records and electronic equipment – the organisation has claimed.

WikiLeaks said neither Assange’s lawyers nor United Nations officials were allowed to be present for the handover of possessions. The material is said to include two of Assange’s manuscripts.

His lawyers said an illegal seizure of property had been requested by the US, describing the country as “the agent of political persecution” against the WikiLeaks founder.

Assange 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 after authorities there charged him with conspiracy to commit computer intrusion.

Key moments for Julian Assange Show all 9 1 /9 Key moments for Julian Assange Key moments for Julian Assange The situation today Assange was arrested after Metropolitan Police officers were invited into the Ecuadorian embassy on April 11 2019. How did it come to this? Ruptly TV Key moments for Julian Assange The break Assange shows the front page of the Guardian on July 26 2010, the day that they broke the story of the thousands of military files leaked by WikiLeaks AFP/Getty Key moments for Julian Assange Wanted A warrant for Assange's arrest was issued in August 2010 for counts of rape and molestation in Sweden AFP/Getty Key moments for Julian Assange Ruling The UK's Supreme Court ruled in 2012 that Assange should be extradited to Sweden to face trial Getty Key moments for Julian Assange Sanctuary Following the ruling, Assange was given asylum by the Ecuadorian governement over fears that his human rights would be violated if he were extradited, he has since remained in the embassy in London Getty Key moments for Julian Assange A friend in Pam Friend Pamela Anderson delivers lunch to Assange at the embassy in October 2016. She has since spoken against his arrest Getty Key moments for Julian Assange Arbitrarily detained A UN panel found in 2016 that Assange had been arbitrarily detained and that he had not been able to claim his full right to asylum. It urged Sweden to withdraw the charges against him Getty Key moments for Julian Assange The cat ultimatum Last year, the Ecuadorian embassy threatened to revoke Assange's internet access unless he stopped making political statements online and started taking better care of James, his pet cat. Assange accused Ecuador of violating his rights Reuters Key moments for Julian Assange Arrest Assange was arrested on April 11 2019. Ecuador revoked his asylum status and invited the Metropolitan Police in to the embassy to arrest him. Reuters

Kristinn Hrafnsson, editor-in-chief of WikiLeaks, said: “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,” she added.

Baltasar Garzon, international legal coordinator for the defence of Assange and WikiLeaks, said: “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.

“It is an unprecedented attack on the rights of the defence, freedom of expression and access to information exposing massive human rights abuses and corruption. We call on international protection institutions to intervene to put a stop to this persecution.”

Ben Brandon, the lawyer representing the US at a recent extradition hearing, said there were computer room chats showing real-time discussions between Chelsea Manning and Assange over an attempt to gain access to classified US documents.

Earlier this week Swedish prosecutors announced they would reopen a 2010 rape case against the WikiLeaks founder.