Swedish police have dropped an investigation into a fire at a mosque in central Sweden on Christmas Day, ruling out criminal activity.

How the mosque blaze in Eskilstuna, some 90 kilometres west of Stockholm, started is still unclear, but police have ruled out that the fire was suspicious.

"There is nothing that indicates that anybody from outside the mosque wanted to cause any harm," Fredrik Wallén, a regional police spokesman, said in a statement on Friday.

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