“We hope that this threat is not real,” party spokesman Oskar Cavalli-Bjorkman told AFP, adding they're awaiting the Swedish security and intelligence service Säpo's assessment.
A copy of the threat letter, with the Islamic State group's flag at the top, was published by Swedish media.
“We will behead you if you do not withdraw from the election by the end of this week,” the letter reads, adding a similar threat against Åkesson's four-year-old son.
Säpo confirmed that it has launched an investigation into the incident.
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