No one is injured, says police spokesman Mats Eriksson.
The incident is classified as a serious unlawful threat and a serious violation of the Weapons Act.
Several witnesses have called in with observations.
The alarm was received just before 1 p.m.
Shots fired at apartment door in northwest Stockholm - man detained
A young man has been detained on suspicion of firing several shots at a door in an apartment building in northwest Stockholm on Friday, police said.
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