It is a serious crime that we take very seriously, says the police's press spokesperson Angelica Forsberg.
The site will be examined by the national bomb squad to determine what it is that exploded, the police report.
A building was damaged in connection with the explosion, but there is no information about personal injuries.
The police have initiated an investigation into serious crime against the law on fire hazardous and explosive goods, as well as serious illegal threats.
There is currently no one detained in the case.
Of course, we are looking for the perpetrator or perpetrators. The investigation is partly about securing tracks to find possible escape routes and similar, says Angelica Forsberg.
The police were alerted to the area at 19 o'clock after calls about a loud bang.
