By Lee Han-soo

Students from a middle school in Daejeon face disciplinary action for masturbating in front of a female teacher during a class.

Nine first graders performed the act on June 21, according to the Daejeon Metropolitan Office of Education (DMOE) Tuesday.

The teacher immediately left the classroom and reported the incident to the school, which notified the DMOE.

"According to a survey done by the school, it turned out that this was not the first time group masturbation had happened," a DMOE official told Yonhap News Agency, a Korean news outlet. "We are considering opening a full investigation into all students that attend the school."

The school has established a committee to decide the students' penalty. The teacher has been withdrawn from teaching first-grade classes.

Outraged Netizens demanded the expulsion of the students.

But an Electronic Times story claimed the school only ordered the students to complete a five-day sex-education class.