Why is violence spreading among universities in Hong Kong?

Rioters continue to disrupt traffic and attack people in Hong Kong. The local education bureau says schools will remain closed through Sunday, out of concern for students' safety. Police are beefing up security around universities, where tension remains high. Police have shown footage of rioters apparently preparing for more actions across campuses. Police have made hundreds of arrests. Recent arrests suggest it's mostly students involved in the riots. CGTN talks to Benjamin Chiao, a professor at the Paris School of Business, who previously worked as an educator in Hong Kong.