The alarm came in just before 03 after a caller heard an explosion, saw smoke and that something had been thrown into a premises.
The National Bomb Protection and the police's crime technicians have investigated the crime scene during the night. At 06.30, the blockades were lifted.
We have an indication of what has exploded, but I do not want to comment on it at present. There are no extensive damage to the property, and there are no reports of personal injuries, says the police's press spokesperson Fredrik Bratt.
A report regarding public endangering destruction and serious offense against flammable and explosive goods has been filed.
We have witness statements that a person should have run from the scene and we will also check various cameras in the area, says Bratt.
