Sweden’s Prosecution Authority reopened an investigation of Julian Assange for rape on Monday and will seek his extradition from Britain, the country’s deputy director of public prosecution, Eva-Marie Persson, told reporters in Stockholm.

The Swedish request will force British authorities to decide whether to send the detained WikiLeaks founder to Sweden or the United States, or neither, at the end of his 50-week jail sentence. He is currently serving for violating bail conditions in 2012, when he took refuge in Ecuador’s London embassy after losing his final appeal against extradition to Sweden.

“On 20 August 2010, a police report was made regarding a suspected rape in Enköping, Sweden on 17 August 2010. The alleged offender was reported as being the Australian citizen, JA, born 3 July 1971,” the prosecution authority said in a written explanation of the decision. “The courts in Sweden have, on several occasions during the preliminary investigation, considered the decision to detain JA in his absence, and on each occasion found there exists probable cause for JA to be suspected of rape.”

At a news conference on Monday, Persson said, “After reviewing the preliminary investigation in its current state, my assessment is that there is still probable cause that Mr. Assange committed rape.”

Elisabeth Massi Fritz, a lawyer for Assange’s unidentified Swedish accuser, said that her client welcomed the reopening of the investigation, despite the “great deal of hate” she has faced from supporters of the WikiLeaks founder who have cast doubt on her claims.