Just before midnight on Sunday, the police were alerted that a serious robbery had been carried out at the address.
According to information to Upsala Nya Tidning, there has been a shooting.
We can neither confirm nor deny it, says Magnus Jansson Klarin to TT.
Three people were taken to hospital, but none of them are seriously injured. Two people were arrested and later detained by the prosecutor on duty.
The police are very tight-lipped about those involved and only want to say that the two detained are adult individuals.
The crime scene was cordoned off for a technical investigation. The police are also going door-to-door in the area to try to find witnesses.
