The alarm about the incident came in after 1 a.m.
We can quickly find signs that there has been some form of shooting at the scene - shell casings on the ground, says Joar Källman, a command officer with the police.
The police have no information that anyone was injured and do not want to comment on whether anyone is in custody or is a suspect in the case.
The incident is being investigated as a serious violation of the Weapons Act and a serious unlawful threat.
So far, they have not found what was shot at.
The area is cordoned off and dog patrols are on site searching for clues. A technical investigation will be carried out, video footage will be examined and interviews will be held.
