The three known victims work in the same department and fell ill quickly, according to police. One fell ill on October 25, the other two on November 3.
Now prosecutor Emma Häggström confirms UNT's information - that a fourth person has fallen ill. According to her, the symptoms are similar.
The illness occurred over a short period of time and they work in the same department at the hospital, says Häggström.
The new case is seen as linked to the previous ones.
It is being investigated as the same case, says Emma Häggström, adding that they are awaiting the analysis report.
A preliminary investigation into attempted murder has been launched, but no suspects have been identified at this time.
