Police have opted not to reveal whether they have identified any suspects for the attack.
“We have begun a preliminary murder investigation. That is our only comment,” said police spokesman Anders Börjesson.
Police have also begun a forensic examination of the murder scene.
A number of media reports suggest that police attention has been directed towards an apartment in a nearby residential area.
Expressen and Aftonbladet both report that the shooting incident was connected to a gang fight in the area last week, in which a 15-year old was stabbed and seriously injured.