The suspect’s defence lawyer Johnny Veum told Norwegian public radio on Wednesday that his client had confessed to the fatal stabbing on Tuesday.
Norwegian police quickly arrested two suspects, one Norwegian man and one Swedish, when the crime was first discovered. They have now added three additional suspects, including the 28-year-old, to the tally. The youngest suspect is an 18-year-old Norwegian woman, while the later set of arrests also brought in a 20-year-old Norwegian man.
The woman was found inside a house in Oslo, while an injured man, now believed to be her boyfriend, was found outside. They both had stab wounds.
The boyfriend has been able to speak with the police despite his injuries.
“After interrogations on Wednesday we have an even better picture of what happened,” said local police spokeswoman Grete Lien Metlid to the TT news agency.
She said they had been in touch with Swedish police to find more information on the victims and one the two Swedish suspects.
When news of the crime broke on Tuesday, Verdens Gang reported that the victim had recently felt uneasy at her apartment after it was burgled.