There is a fire inside the building, and it has spread to the attic, says Henrik Döwoon-Thoren, a duty officer with the rescue service, to TV4 Nyheterna.
According to him, a couple of people threw something into the premises.
"They threw something burning in," he says.
The fire service has not yet brought the fire under control, and the police are at the scene with several patrols.
Because information indicates that the fire was started deliberately, the police say they have opened a criminal investigation into aggravated criminal damage.
