OAK PARK, Illinois — Some students at a suburban Chicago high school received an image of a swastika on their smartphones days after racist graffiti was found scrawled on school property.

Oak Park and River Forest High School informed parents by email that the image appeared on students’ devices while they were attending an assembly in an auditorium Friday morning. School spokesperson Karin Sullivan said someone inside the auditorium sent the image using the AirDrop function of an iPhone or other Apple device.

Sullivan wrote to parents that school officials “believe we have brought this particular matter to closure” but privacy laws prohibit the school from making public the names of “persons responsible.”

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The school posted a statement Friday saying police identified “a juvenile as a person of interest in connection with the electronic distribution of an anti-Semitic image to some Oak Park and River Forest High School students,” according to the Chicago Sun Times.

Once last week and again this week, racist messages that included swastikas were found at the school.

The first attack targeted an African-American special education teacher at the school, Anthony Clark, with the perpetrator(s) writing “F— dancing n—– Anthony Clark,” and “white power,” accompanied by two swastikas.

Hey OPRF, how about taking this bullshit down!?! Over a week and you leave it up!! This is OPRF…This is Oak Park Posted by Shelly Jamison on Friday, 2 November 2018

In the second incident, this past Tuesday, the vandals wrote “all n—— need to die,” “white power,” “death to blacks and muslims” and “GAS the Jews.”

Clark has organized a march against hate set to take place on Sunday. “I am calling for all religious leaders, all community members, all allies, to come together in support of Black, Jewish, and Muslim communities this Sunday, to stand firm against hate,” he wrote in an invitation on Facebook.