Julian Assange's possessions from his time living in the Ecuadorian embassy in London will be handed over to US prosecutors on Monday, according to WikiLeaks.
Ecuadorian officials travel to London to allow US prosecutors to "help" with goods including legal papers, medical records and electronic equipment, it was claimed.
WikiLeaks said UN officials and Assange's lawyers were stopped for attendance. Lawyers said it was an illegal seizure of property requested by the US authorities. The material is said to contain two of Assange's manuscripts.
Assange was pulled out of the embassy last month and serves a 50-week prison sentence for violations of citizens. He is facing a US extradition request next month.
Kristinn Hrafnsson, editor-in-chief of WikiLeaks, said: "On Monday, Ecuador will perform a puppet show at the Embassy in Ecuador, London for their masters in Washington, in time to extend their extradition case before the British deadline of 1
Baltasar Garzón, the international legal coordinator for the defense of Assange and WikiLeaks, said:" It is extremely worrying that Ecuador has continued with the search and seizure of property , documents, information and other material belonging to the defense of Julian Assange, which Ecuador arbitrarily confiscated so that they can be transferred to the police for political persecution against him, the United States.
"It is an unprecedented attack on the right of defense, freedom of expression and access to information that exposes massive human rights and corruption violations. We urge international protection institutions to intervene to stop this persecution. "