Derby, Kan. (AP) – A former Derby Public Schools paraprofessional has been arrested on suspicion of unlawful sexual relations with a student.

Derby Police Chief Robert Lee said the woman was arrested Thursday. Authorities believe the incident happened between April and May at Derby High School. According to Lee, the suspect is currently not employed by the school district.

A school district alert sent to parents said the suspect had resigned before any allegations were reported to law enforcement or the school district.