Julian Assange has missed his court hearing via a video link from a British prison, with his lawyers saying his health has deteriorated severely.
Assange's lawyer Gareth Peirce said he is now incapable of even holding a conversation.
WikiLeaks said he had been moved to a health ward at Britain's Belmarsh prison, and he has lost a lot of weight.
Assange was scheduled to appear in court for a US extradition hearing over hacking and espionage charges.
The next hearing on the extradition request was set for June 12.

Five dead as Mexican plane crashes off Texas coast
Two killed in underground explosion at Polish coal mine
Netanyahu to discuss Iran, next phase of Gaza plan with Trump
US President unveils 'Trump-class' battleships
Cambodia, Thailand to hold talks on resuming Trump's truce