The alarm came shortly after 5pm on Thursday.
– There is some object that has exploded, I don’t know what kind of object at the moment. There has been minor material damage to a door, says Nadya Norton at the police in Stockholm.
According to the police, there are currently no reports of any injuries.
P4 Stockholm was the first to report the alarm.
Earlier in the day there were alarms about an explosion in a stairwell in Ösmo, as well as a shooting at a house in Tyresö, if there is any connection to these events it is too early to say, according to Nadya Norton at the police.