The police entered the campus of Hong Kong Polytechnic University on Thursday, accompanied by members of the bomb squad and hazmat units from the fire department. According to the police, they have two goals. The first is to collect evidence of crimes committed over the last 10 days or so on the campus. Secondly and most importantly, the other goal is to deal with all of the hazardous materials on site. CGTN's reporter Jim Spellman tells us more from the campus.