Police were called to the three-storey apartment building around 3.30am on Saturday. They found the dead man in one of the apartments and confirmed that he had likely been murdered.
Police immediately arrested two people inside the apartment building who after questioning were detained on reasonable suspicion of murder or manslaughter.
A third person was first detained in absentia on reasonable suspicion of murder and was later taken in for questioning. A fourth person was also taken in for questioning on Saturday afternoon.
Police spokeswoman Sofia Karlsson said that those involved were over 18 years old and that they knew each other. “We cannot reveal their exact connection,” she said.
The identity of the victim had not been confirmed on Saturday afternoon.
“We have our suspicion as to who it is, but the medical examiner has to complete the identification and relatives must be notified,” said Karlsson.
Residents in neighbouring apartment buildings told local newspaper Östgöta Correspondenten (Corren) that they had not noticed any of the drama on Saturday morning, but said that the building where the dead man was found had been marred by drunkenness and fights.
On Saturday, police conducted a forensic investigation and knocked on doors in the area in search for a murder weapon. Police have also urged members of the public to call in with any tips.
According to the Expressen tabloid two of the detainees are previously known to the police. Karlsson told Expressen that it is not likely that more arrests will be made over the murder.