By The Associated Press

DURHAM, N.H. (AP) — Boston Public Schools and the University of New Hampshire are investigating who’s responsible for sending a racist image to some high school students about to perform at a regional jazz festival.

NECN reports Boston Arts Academy Headmaster Anne Clark sent a letter to students’ families saying students “were subjected to disturbing incident of racism” at the Clark Terry UNH Jazz Festival in Durham, New Hampshire, on Saturday.

(Screengrab via news video)

NECN reports students were sent an image via the “AirDrop” feature on an iPhone. The picture is a selfie edited with black marker on the person’s face. The caption at the bottom reads, “Celebrate black history month.”

Boston Public Schools said in a statement it was “deeply disturbed” by what happened and UNH said the behavior has no place on their campus.