A source told Swedish news agency TT that three to five shots were fired.
“It is correct that someone appears to have fired a weapon in a stairwell or something similar,” a police spokesperson told the Expressen tabloid.
One person was in custody. There were no reports of serious injuries.
A person who witnessed the arrest told Expressen that the suspected shooter appeared to be a very young person.
According to Swedish media the shooter fired a gun through the window of a business venue.
The metro station at Rådhuset is partially cordoned off, but trains are still calling at the station.
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