En ny brand utbröt natten till onsdag i ett ödehus i Garpenberg. Det är den fjärde liknande incidenten i området under våren.
Polisen misstänker mordbrand och har bett allmänheten om tips för att lösa fallen.
För att öka tryggheten kommer polisen att synas mer i Garpenberg.
Insatserna syftar till att samla in fler uppgifter från boende i området.
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A major fire broke out in a warehouse in Älvsjö, southern Stockholm, on Thursday evening. The blaze remained out of control past midnight with smoke spreading across the southern part of the city.
An extensive fire broke out in the night to Wednesday in a two-story house in Garpenberg. It is the fifth fire in the area in a short time and police are investigating the incident as suspected arson.
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A building was completely destroyed in a fire on the night of May 27 in Garpenberg. It is the fifth fire in the area in a short time.
A major fire broke out in an agricultural building south of Bälgviken in Eskilstuna on Tuesday. Police and rescue services moved horses from a nearby stable to prevent spread. The fire was under control around 6:30 p.m., with no injuries reported.
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A large fire broke out in a barn in Vretstorp in Hallsberg municipality on Friday evening. At least two people have been taken to hospital by ambulance. The fire spread to several buildings and affected traffic on the E20.
A villa in the countryside north of Habo was totally destroyed in a fire on Tuesday evening. Fire services could not save the house, but no one was injured. Police suspect negligence and have opened an investigation.
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Police are investigating a suspected serious crime in Norrköping's Marielund area following an alert just before 9 p.m. on Thursday evening. One person was injured and taken to hospital by ambulance. Reports to NT suggest a shooting, but police have not confirmed this.