The Swedish Security Service (Säpo) has received a number of worried calls since a video clip from an Arabic talk-show programme started making the rounds online.
On a recent episode of the popular Arabic talk-show programme Su’al Jari (Bold Questions), a man called in from Sweden and proceeded to threaten the country with extreme violence. (See video below, with Swedish subtitles).
"Until the day we die, we will engage in war against Sweden and Europe," the man said.
Swedish Security Police (Säpo) spokeswoman Sirpa Franzén said that the reactions from Swedes had been strong.
"Many people are upset since the video and other information is being spread online in connection to the situation in Syria," she told newspaper Dagens Nyheter (DN).
The caller, identified in the show as Sheikh Ahmed, said he was a member of the jihadist group IS (Islamic State, previously ISIS, Islamic State of Iraq and Syria) and began making references to the Koran, saying that god had given Muslims instructions to kill non-believers.
The talk show is hosted by Rashid Hmami, a Moroccan who converted from Islam to Christianity when he was 19. Hmami proceeded to grill the caller about verses of the Koran and his methods of enforcing his religion.
Franzén at Säpo said that the agency takes all threats seriously, adding that the agency is already working on investigating the matter.
"And it will determine whether he actually has the capability to turn this threat into a reality," he told The Local.