ASIO boss Duncan Lewis was quizzed on the issue by One Nation leader Pauline Hanson at a parliamentary committee on Thursday night.
“I have absolutely no evidence to suggest there is a connection between refugees and terrorism,” Lewis said.
Asked whether refugee children were being radicalised in Australia, he said: “I see no evidence of it here.”
Lewis told Hanson ASIO did not make its enquiries or assessments on the basis of anyone’s religion.
“We are not interested in religion – we are interested in whether an individual is exhibiting or expressing violence.”
Asked whether women wearing burqas presented a security threat, he said: “We have no security reason to be concerned about the wearing of a burqa other than the requirement for individuals to identify themselves to authorities.”
He said not all thwarted terrorism plots had involved Islamist extremists – one recent investigation uncovered a right-wing extremist planning an attack.
Hanson campaigned at the last election on banning Muslim refugees and shutting down mosques.
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