Shortly after 11pm on Monday evening, the police received an alarm about several explosions in Märsta, north of Stockholm. On the spot, the police were able to establish that shots had been fired at an apartment.
It is unclear if anyone was in the apartment at the time, but no one is said to have been physically harmed.
During the night, the police held interviews and carried out a technical examination of the crime scene.
The incident is being investigated as attempted murder and aggravated weapons offences, but it is unclear if anyone has yet been arrested.