Police were notified of the event shortly after 10 pm on Tuesday night.
Between 30 and 50 people will be in big trouble in southern Stockholm in the Slakthus region. Initially it is not clear if there are any injured after the noise. Police wrote a report on abuse, but no one was arrested.
"We had four patrols like most of what I saw," says Anders Mattsson.
A man should have been sent with a gun, according to information for Aftonbladet.