Anti-Semitic graffiti was found Monday at a high school in central Stockholm that holds special classes for Jewish students, The Local reported.

One parent, Calle Nathanson, told the English-language news network that his 13-year-old daughter saw the graffiti as she was heading into school on Monday morning. Nathanson tweeted photographs of the graffiti, and wrote that it was "completely incomprehensible and unacceptable." He also tweeted that he was in tears over the incident.

The graffiti included swastikas, the phrase "Jewish swine" and "disgusting Jews." The vandals also sprayed the number "1488," which symbolizes the Nazi greeting "Heil Hitler" on the building.

The school, which has 800 pupils between the ages of 11 and 15, closed for the morning while the graffiti was cleaned up, and the school decided what steps to take.

According to the Vasa Real website, the school has three classes at the high-school level where Jewish pupils study the Swedish curriculum along with Jewish and Hebrew studies.

Nathanson told the Local that his daughter did not really understand the meaning of the scrawlings.

"She was curious... she said to me that she thought it was just drunk and stupid boys in the night. It's hard to understand. But me, I know that there's a wave of Nazism spreading through Europe right now. Greece, Hungary, Ukraine... this is populist parties emanating from fascism. And it's happening here. Especially in Stockholm," The Local cited him as saying.