WikiLeaks founder Julian Assange has been moved to the heath ward of Belmarsh prison.
On Wednesday night the company released a statement confirming the move, adding that they have “grave concerns” over the state of his health.
At the start of this month Mr Assange was jailed for 50 weeks for skipping bail in 2012.
“Mr Assange’s heath had already significantly deteriorated after seven years in the Ecuadorian embassy, under conditions that were incompatible with basic human rights,” the group said in a statement.
It added: “During the seven weeks in Belmarsh his health has continued to deteriorate and he has dramatically lost weight. The decision of prison authorities to move him to the health ward speaks for itself.”
The move came a day before Assange was due to appear via videolink for the latest hearing in his extradition case.
Assange is facing extradition to the US, accused of conspiring to break into a classified Pentagon computer and facing 17 charges under the Espionage Act.