Around 30 cases regarding teachers' professional misconduct have been preliminarily established as Hong Kong's Education Bureau (EDB) mulls punishment.

The bureau said they've already finished investigating around 60 individual cases with connections to recent social unrest in the city, 30 of which have been "preliminarily established" now.

EDB is currently looking into 106 cases involving teachers as of mid-November since June.

But the exact number of teachers that have been arrested was not revealed to the public due to ongoing legal procedures.

The latest arrest of a teacher was made on Monday morning when police seized materials including homemade barricades, flammable liquid and glass bottles that could be used to make petrol bombs during a raid in Sheung Shui.

Along with one teacher, six students were also detained by police in the operation.

The education bureau has asked for the teacher's suspension following his arrest.

An EDB spokesperson emphasized that teachers are role models to students, saying the bureau would strictly follow up every related case and those who are convicted may face cancellation of registration.

On Tuesday, Chief Executive of Hong Kong Special Administrate Region (HKSAR) Carrie Lam said she has ordered the head of EDB to "seriously follow up" on any teachers arrested or found to have "violated rules," as she fears violence in campuses would affect the safety of schools, students, as well as parents.

More than 6,000 people, about 40 percent of them students, have been arrested in security operations since protests and rioting began in Hong Kong six months ago.

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Hong Kong police: Over 6,000 arrested since June, of whom 40% are students

(With input from Xinhua News Agency)