The alarm arrived just after ten o'clock on Sunday morning.
"The homeowner's son had been on a visit last night, and when he came back this morning, he met smoke and grime in the building," Karlsson said.
– When the oxygen in the house ceases, the fire goes to sleep, and that is why the whole house is not burnt down. There were a few flares that flared up when we arrived at the place.
However, fire and heat have been damaged throughout the house.
The reason for the fire is currently unclear.
A police investigation will be requested from the police.
"When the incident can be considered a death with some unclear circumstances, an initial investigation has been started into crime, more specifically murder," said Stefan Dangardt, president of the police in the Bergslagen region.
"In this case it can not be excluded that there has been a crime or that there has been no crime, nor can it be ensured that the deceased is the owner of the house.