DES MOINES, Iowa (AP) — Authorities say an 18-year-old Drake University student who reported being the target of racist notes is responsible for four of five of the notes recently left in residence halls. The Des Moines Register reports that the female student, whose name was not released Friday, faces criminal harassment charges. Drake spokesman Jarad Bernstein also says the student will be subject to discipline, including possible expulsion.

School officials say the student admitted writing one of the notes. Officials say they are confident she is responsible for four notes described as “copycat hoaxes” of an initial racist letter slipped under the door of a different student in early November. Authorities say that first note is not connected to the other four notes.

The notes and subsequent racist robocalls to students and staff from a white supremacist group prompted a campus anti-racism rally Nov. 14.