A villa was shot at in Skälby in Västerås late on Monday evening. No one has been hurt and the crime scene has been cordoned off.
The police do not comment on whether anyone has been arrested.
I cannot say anything more at present, it is a dynamic situation, says Fredrik Lindström, commander at the police's regional command centre.
The alarm came in at 23.20. A preliminary investigation into attempted murder and aggravated weapons offence has been initiated.