40 armed police armed with assault rifles and an armoured BearCat vehicle surrounded a house in Sydney for three hours in a tense standoff with a man believed to be involved in a shooting. Police, using a megaphone ,tried to coax the man out but after getting no joy they sent in specialist officers from the Tactical Operations Unit to force their way into the house. Problem was the house was empty. Awks. Still no word on who or where the gunman is.