The alarm came in after 1 a.m.
We can quickly find signs that there has been some form of shooting at the scene; we are talking about shell casings on the ground, says Joar Källman, a command officer with the police.
Shortly after the shooting, a man was arrested and later taken into custody by prosecutors, the police wrote on their website.
The police have no information that anyone was injured. The incident is being investigated as a felony violation of the Weapons Act and as a felony unlawful threat.
So far, they have not found what is thought to have been shot at.
