Finnish security police have identified a Finnish-language blog disseminating propaganda by the extremist Islamic State organisation. The blog has been used to share content such as speeches by IS leaders as well as texts from the group's online paper, translated into Finnish.

According to Supo, the blog has been in existence since last August and officials described the translations as reasonably clear Finnish, although peppered with some foreign words.

"The blood of kaffirs is halaal [acceptable] to you so let it flow," one section of texts urges.

Supo added that the writings say that sowing fear in the hearts of infidels is the duty of Muslims.

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