you could see how thick this glass is here. double layered plastic in the middle. this is now a crime scene. the police have put up the police wire and if you look behind you could see the graffiti written up and just over here to the side where they smashed their way through the steel doors inside to get inside of that building. a huge amount of graffiti with just -- we just heard from the chief executive here saying there were good protesters and bad protesters today and the rule of law is important and wants the people of hong kong to reflect on what we learned from the police chief in the last couple of minutes he had to evacuate his officers because all of the civilians workers had led the building and the office was under siege and a white powder was being used and he didn't know if it was toxic and he called his police officers out and that was at 9:00 in the evening and that is when the protests got in and did the damage and that is when the chief executive is calling bad, breaking the rule of law and wants people of hong kong to reflect on that. >> nic robertson in hong kong.