Australians see Islamic State as the biggest threat to the nation, with one-third of people concerned about refugee hordes, global research shows.
Terrorist atrocities concerned 59 per cent of Australian respondents who took part in a Pew Research study, taken before Saturday's terror plot raids across Sydney.
Boat arrivals are also a major concern, with 33 per cent of those surveyed seeing it as a major risk to Australia.
Australians are concerned about IS terror with 59 per cent of respondents in a Pew Research survey nominating it as an issue (Melbourne teenager Jake Bilardi pictured with IS militants)
One third of Australians are worried about refugee arrivals (Christmas Island vessel pictured)
Australians are almost as worried about IS terrorism as people in Israel, where 63 per cent of respondents