According to the police, the fire was caused by the staff pressing the burglar alarm after a person entered the store and messed up.
– A person has been inside the store and in connection with that a fire has started, says Magnus Jansson Klarin, press spokesperson for the police to VLT.
According to the emergency services, it is a fully developed fire.
Due to the strong development of smoke, a VMA has been issued to the public in Haga in Västerås municipality. The rescue leader urges everyone in the area to go indoors and close doors, windows and ventilation.
According to TV4 Nyheterna, a person has been arrested at the scene. The place is cordoned off and the incident is being investigated as arson.
It is unclear if anyone has been injured.