“It is the circumstances that make us suspect murder. The people present at the time of the incident, what others have seen and heard,” said Kjell Hellström of the Stockholm police to news agency TT.
The young woman was discovered lying on the ground next to an apartment building in northern Stockholm by residents in the area early on Thursday.
“There were several calls coming in saying she was lying there,” Hellström said to newspaper Aftonbladet.
Police arriving on the scene thought that the circumstances were “suspicious” upon entering the flat where the young woman lived and a preliminary investigation into murder has been initiated.
“She was taken by ambulance to a hospital but died there,” said Mats Eriksson of the west Stockholm police to TT.
The police were unwilling to comment as to whether the woman was injured in any other way than from the fall.
Two people near or in the flat when the police arrived were brought in for questioning over the course of Thursday, but according to police they will be released. Officers working on the case have no other suspects at the moment.
Police think they know who the girl is but they still need be 100 percent certain in their identification of her.
During Thursday officers have been taking witness statements from residents in the area.
“We are now working on interrogating these people we have brought in and finding out who she is,” said Hellström to Aftonbladet.