(CNN) A Long Island, New York, school district is investigating reports that a picture of nooses labeled "back to school necklaces" was displayed in a middle school classroom.

Arthur Mackey Jr., a pastor at Mount Sinai Baptist Church Cathedral in Roosevelt, said he received the image -- which is part of a larger collage reportedly displayed in a classroom -- from a teacher in the school system. He posted it on Facebook and called on the school district to take action.

"When I heard about it I said that this is outrageous," Mackey told CNN. "The majority of students are minority students, African-American and Hispanic. For the image to be on the wall ... is totally unacceptable."

In a statement, the Roosevelt School District said it is aware of the "inappropriate conduct" and investigating. The school district said it is unable to comment further, calling the incident a "personnel matter."

"The Board of Education has zero tolerance for the display of racially offensive images," the district's statement said.

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