The indictment claimed Assange had conspired with former US intelligence analyst Chelsea Manning to assist in cracking a password on US Department of Defence computers on a network meant for classified information.
Assange was arrested at the Ecuadorian embassy in London on Thursday night. He had been taking refuge there since June 2012 after having been granted asylum by Ecuador.
His arrest came after Quito withdrew his asylum and London Metropolitan Police were invited into the embassy to take him to jail.
"During an exchange, Manning told Assange that 'after this upload, that’s all I really have got left'. To which Assange replied, 'curious eyes never run dry in my experience'.”
Appearing in court in London shortly after his arrest, Assange was found guilty of skipping bail in 2012 and remanded to custody. He will appear in court again to be sentenced and faces up to 12 months in prison for this offence.
He was separately charged in relation to the US indictment and will appear in court on 2 May in connection with these charges.
The US indictment says the charges levelled at Assange carry a maximum prison term of five years.