It is still unclear what detonated.
The building must not have suffered major damage during the explosion.
- It is a residential property and on the ground floor there is a room that houses a restaurant.
It should be broken glass from a balcony, says Åsa Wallentin, press spokesperson at the Stockholm Police.
- There were several people who called us because they woke up from the bang.
According to the police, a car must have been seen leaving the scene in connection with the incident.
The police are currently hearing witnesses and will carry out door knocking in the area.
A preliminary investigation into general destruction has been launched.