Twelve employees of the Berkeley County School District in Charleston, S.C., were placed on administrative leave with pay for passing vulgar and sexually-oriented photographs through the district’s eMail system, a district official said.

The employees–including teachers, administrators, and members of the district office support staff–were placed on leave in January while the district investigated the allegations. Superintendent Chester Floyd would not release further details, except to say that the employees appear to have disregarded both the district’s internet guidelines and professional ethics.

The superintendent said he received an anonymous letter Jan. 12 that described inappropriate use of school district computers. The letter came with a list of eMail users involved and the picture, which Floyd described as “a graphic pictorial with sexual content.”

The Berkeley County Sheriff’s Office has been notified, but the case has not been turned over to the police. No students saw the material, school officials said.