The victim and suspect were in a relationship.
During the night, several police officers reported that the suspected murder weapon, a knife, was still in the woman’s body when the first officers arrived to the suspected crime scene.
Nils Fyhr, head of the local Roslagen police station, was unable to confirm this information on Sunday morning. He was also unwilling to comment on whether any murder weapon had been found.
“All we can say is that the woman probably died of knife wounds. We think she was killed and that it was a stabbing,” he said to news agency TT.
The police were alerted of the killing just before 1am, when a person called the police after having found her body.
The suspect was arrested just 20 minutes later, a man whom the murder victim had a relationship with, according to the police.
The woman was found in a summer residence area, but police were unwilling to divulge whether the body was found indoors or outdoors.
There is no known motive to the crime, although police have yet to interrogate the suspect. However, several people who may have information about the crime have been interviewed.