that has not eventual -- this is in the heart of the city. as i say, everyone very much on high alert. >> i heard the prime minister and also officials from the new south wales police telling people yes this is an isolated incident. isolated as you say the focus is on this coffee shop. they are not at this point investigating events else where in the city. it is a strange event going on for ten hours. police are in contact with the man holding people hostage. as this event goes on, there are people calling radio stations and there are reports of posting messages on twitter and social media, anna. >> reporter: yes, certainly there are those messages being placed on social media. we have taken a decision not to report those messages purely