An mysterious explosion at a Post Office in Borlange in central Sweden has been traced back to a fire extinguisher. The explosion which injured 6 people was unexplained for a period of time prior to authorities tracing it back to an extinguisher.
According to The Local - A Swedish news website:
The explosion caused a the terminal to fill with smoke and left several people covered in white dust. Around 30 affected staff were given treatment to counter anthrax, but the whole episode turned out to be a false alarm caused by a power extinguisher.
...Police received an alarm over the explosion at 8.20am on Wednesday morning. The premises filled with smoke and the white powder filled the air, [Dalarna police spokesperson] Petters told The Local earlier on Wednesday.
Dalarna police led the investigation into the explosion although the Security Service followed developments after having been informed of the incident.
Fire Extinguishers are not known to spontaneously explode, however they are being used as improvised explosive devices (IEDs) more and more often. We'll keep you posted as the story evolves.