>> it's not something i can confirm at the moment, and it's not particularly useful to actually confirm potential numbe numbers. for people who we might be dealing with who might have concerns that a friend or a relative or a loved one might be in that building, we have set up our -- >> nb[ inaudible ]. how many maybe inside. >> that is a tactical, operational imperative. >> why is that so sensitive? >> because at this point everything has to be about the safety of the people in the location. so it's important we don't confirm at this point. >> that's catherine burn, the deputy police commissioner for new south wales speaking a short time ago, give us a little bit of new information, which was essentially what we've heard from a number of people of the demands being listed on twitter