
Asked about intelligence that he and other senior officials may be attacked, Prime Minister Tony Abbott said: "There is chatter, there has been chatter, amongst these networks of targeting government people.
"There is no doubt about that. That is why we are in the process of upgrading security at Parliament House in Canberra."
Federal police are being put in charge of security at parliament, Abbott told Nine Network television after earlier describing the building in the nation's capital Canberra as "a potential target".
"There has been chatter amongst these terrorist support networks for some time about possible attacks on government here in Australia," he said.
Previously security was handled by in-house parliamentary security officers.
Abbott's comments came after hundreds of police officers staged a major pre-dawn operation across Sydney and Brisbane on Thursday.
Of the 15 people detained in the raids, one has been charged with terrorism-related offences and nine released, police said. At least one gun was seized, along with a sword.
AFP