While people started calling the police about the bang, the alarm went off at the police station.

- The site is blocked off and the national bomb protection has been called in, says Calle Persson, press officer at the police command center.

According to the police, only the entrance is damaged. No other buildings have been damaged. There is also no information on personal injury.

Police technicians were on site during the morning to investigate the scene. Photo: Mikael Nilsson

Has any person been seen on the scene?

- It is too early to say if anyone appeared until we hear with witnesses, says Calle Persson.

He says they are now looking for surveillance cameras at the square where the police house is located.

In the morning, forensic technicians will conduct an on-site investigation.