The 34-year-old woman, with an Ethiopian background, was attacked at her workplace during the night leading up to Sunday. She was found with severe lacerations and stab wounds, among other things, to the neck and chest, according to Norwegian TV2's information.
An 18-year-old man who lived at the residence was arrested shortly after the incident after a taxi driver alerted the police. At the time of the arrest, the 18-year-old claimed to have planned to acquire a firearm and kill more people, including at a mosque, TV2 reports.
In police questioning, he later stated that the murder of the woman was "politically motivated". At the same time, he denies the crime, according to the police.
The 18-year-old is a German citizen and was previously known to the security police PST. However, the threat level was considered low, according to Lars Lilleby, head of PST's anti-terror division. The Oslo police also received reports in March about the man's right-wing extremist views.
But there are limitations to the possibilities the police have (to act) for an action that has not yet been committed, says police chief Ida Melbo Øystese at a press conference.
The 18-year-old has been remanded in custody for four weeks, two of which with a ban on visits.
The remand hearing took place behind closed doors, as the prosecutors feared that the man would use the opportunity to disseminate his message through the media.
We believe that his goal was to spread fear among a part of the population. This is also the reason why he is suspected of a terror crime, says prosecutor Philip Green at the press conference.