A person who was taken care of in an illness died.

The ambulance staff then alerted the police that there were circumstances that indicated that it could be a case of murder.

- We have initiated a preliminary investigation because we can not rule out that a crime has been committed, says Mats Eriksson, press spokesperson at the Stockholm Police.

A person who was in the home where the person was picked up has been arrested and technicians are on their way to the scene.