Antisemitic graffiti was discovered scrawled on a staircase wall at Brooklyn Tech High School Thursday afternoon, city Education Department officials said. A school employee discovered the message reading “Kill All Jews” and a swastika scribbled in black marker on a third-floor stairwell of the 6,000-student high school in Fort Greene around 3:40 p.m. Thursday, police said.

The NYPD Hate Crimes Task Force is investigating have made no arrests, police said.

“This troubling incident was immediately reported to the NYPD, and we’re working closely with the school to support students. There’s no place for this kind of behavior in our schools, and we’re working across the City to combat anti-Semitism in all forms,” Education Department spokeswoman Miranda Barbot said.

Schools Chancellor Richard Carranza and Mayor de Blasio recently announced the city would be offering new lesson plans to teach students about bias and antisemitism, amid a spate of hateful attacks across the city.

The new curriculum will focus explicitly on hate crimes and hate speech, and will be offered to middle and high schools starting next school year.