A school district in Pennsylvania is dealing with the fallout after a number of middle school students created at least 22 fake TikTok accounts that impersonated their teachers — using the teachers’ own photos in some cases — and apparently made some posts using racist, homophobic and sexually explicit language.

The incidents were detailed in a recent report in the New York Times, which called it the “first known group TikTok attack of its kind by middle schoolers on their teachers in the United States."

Daniel Goffredo, superintendent of the Great Valley School District in Malvern, just outside Philadelphia, said in a statement that it “saddens us to know that the students to whom these teachers dedicate their time and talents every day would misuse technology in a way that causes teachers undeserved stress and emotional hardship.”