The graffiti also featured the letter 'N' for 'Nazarene', known to have been written by ISIL terrorists on the doors of Christian families in Mosul prior to the Islamic State's capture of the city last year.
According to DN, this is the second case in a matter of days when ISIL symbology has been found spray-painted on local businesses owned by Swedish Assyrians.
"It's awfully uncomfortable; we feel threatened," Samuelsson told the newspaper.
The Samuelsson brothers own several restaurants in the southwestern Swedish city of Gothenburg, a city of over half a million which about three thousand people of Assyrian background call home.
Samuelsson found the spray-painted warnings at his bakery. According to DN, despite the fact that the square in which the bakery is located has several other restaurants, only businesses owned by Assyrians were targeted. This was the second time in a week that an Assyrian-owned pizzeria has faced this type of vandalism.
"The messages said, among other things, that 'the Caliphate is here' and 'convert or die'. I felt ill; this is terribly unpleasant and threatening," the restaurant owner emphasized.
The Assyrians, a Christian Semitic group indigenous to the Middle East, are a minority which has been made particularly vulnerable to ISIL violence following the terrorist organization's takeover of much of Iraq and Syria over the past year. Last week, ISIL began executing Assyrian men taken hostage in Syria in February, warning that they would kill as many as 200 more if a $100,000 ransom for each is not paid.
"Our family fled to Sweden from Turkey in the 1970s, and what we are facing now is reminiscent of the stories we were told as children. It's so real and threatening that we are afraid for our safety," Samuelsson noted.
People from 26 different nationalities work in the Samuelsson brothers' restaurant chain, and staff were reported to be very upset about the vandalism which took place Tuesday.
Samuelsson has spoken to the police. "I believe that they took our information seriously, but we have not yet received any feedback yet," he noted. "I sincerely hope that they will react to this case with all seriousness. There are people working in the bakery at night, and we are worried that we may be subjected to arson attacks, or something similar," he added.
Josef Garis, the head of the Assyrian district in Gothenburg, told the newspaper that the information is distressing. "No matter who is behind this graffiti, it is painful and traumatic…It feels as if the old persecutions are closing in on us once again," Garis noted.
On Wednesday, the Assyrian community in Gotenburg met to discuss the situation.
Commenting on the graffitied threats on Hujada.com, a local Swedish Assyrian newspaper, commentators voiced their sympathies with the Samuelssons, but also warned that the acts of vandalism may be a 'provocation' aimed at raising hatred toward Muslims.
With an estimated population of 120,000, Sweden has one of the largest diasporas of Assyrians in the world outside the Middle East.