blocks around martin place have been cordoned off and there was a heavy security presence across sydney dbc. they say they're prepared to wait this siege out as long as it takes. they're absolutely determined that it will have a peaceful resolution. they say this is an one-of situation in martin place. they are sure there are no other assistants they have to be worried about. they say they have it contained, they have it under control. and they say there are no injuries inside where the hostage is taking place, and they will make sure that continues. >> what considerations will hostage makers need to make? robin, good to have you with us. in this case the sydney police are happy to go slowly, and resolve this without violence. is that slowly-slowly approach th the best one here. >> yes, that is the best approach. the hostage negotiator will establish himself as the one man that the hostage taker can speak to, and gradually make friends with him. and gradually wear him down and try to convince him to surrender, he has made his statement. he has achieved his objective. that it is now time to