The alarm came just after 4 am on Tuesday morning. The police are on the scene and the national bomb squad has been called in. There are no reports of personal injuries and no one has been arrested.
We are looking for one or more perpetrators, says Nadya Norton.
The case is classified as general endangerment.
The explosion is the 28th since the turn of the year. On Friday, Justice Minister Gunnar Strömmer (M) held a press conference due to the explosions and stated that 24 explosions had occurred. Since then, an additional four have occurred, including the latest one in Kärrtorp.
