The rescue service was alerted to the incident at lunchtime on Sunday, July 7, and when they arrived at the scene, the fire was fully developed.
Later the same day, it was announced that the woman and two of the children had died. Two days later, it was reported that the third child had also died in hospital.
The cause of the fire is not entirely clear. The technical investigation shows that there are no technical faults in electronic equipment or electrical systems in the apartment, according to police spokesperson Thomas Johansson.
In the fire technical investigation, it is stated that the fire was started intentionally or through carelessness with fire and embers, he says to TT.
But there is nothing in the preliminary investigation that suggests that someone intentionally started the fire, he emphasizes.
The fire only spread to one bedroom and started around the beds. The three children and the woman suffered from oxygen deficiency in combination with smoke gases, which led to the fatalities, according to Thomas Johansson.