Within hours of police hauling him out of the embassy, the 47-year-old Australia appeared in court for breaching his British bail conditions back in 2012 and to face a subsequent US extradition request.
After Assange was arrested and dragged into a police van in the British capital, American officials unsealed an indictment against him for computer hacking as part of his WikiLeaks whistleblowing activities.
The Sun tabloid reported he was being held in Wandsworth prison in south London, where he spent nine days in 2010 following an investigation over alleged sexual assault in Sweden that has since been dropped.
Deemed "the most overcrowded prison" in England at its last inspection in 2018, the 19th-century facility holds around 1,600 inmates.
Inspectors found "most prisoners share a cell designed for one person" while more than a third "were receiving psychosocial help for substance misuse problems".
Assange was remanded into prison custody Thursday at a short hearing in front of a London judge, who pronounced him guilty of disobeying his bail terms by fleeing to the embassy in June 2012.
He could receive up to a year in prison when sentenced at an as yet undetermined later date.
His separate extradition case is set to be next heard by video-link at Westminster Magistrates Court on May 2.
"He said: 'I told you so'," Robinson told reporters and supporters, including fashion designer Vivienne Westwood, outside court on Thursday.
Inside the red-brick building he lived a sparse existence in a flat measuring 18 square metres and comprising just a bed, shower, computer, treadmill and microwave.
She accused the British prime minister of "trying to divert attention away from her Brexit dog's breakfast by cheering on the thuggish, brutal, unlawful arrest of my courageous, tortured multi-award winning journalist son".
Legal experts said on Friday that the case could take several years mired in British courts and, if appealed, potentially go all the way to the European Court of Justice.
He added other factors stacked against Assange included "the weight which the UK courts attach to the trust and co-operation between the two countries and the effort the US will likely put in".
Previous comparable cases have taken several years.
Two British judges last year agreed to block the extradition of accused hacker Lauri Love to the US, on the grounds it would be "oppressive", in a ruling hailed a "landmark judgement".
The US first requested Love's extradition in 2013.
Meanwhile Gary McKinnon, a hacker wanted by American authorities for allegedly breaking into military computer systems, waged an ultimately successful decade-long legal battle against his extradition.
Britain eventually said it would not send him to the US because of a high risk he would attempt suicide.
Both Love and McKinnon suffer from Asperger's syndrome, which played a part in the respective rulings.
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