Online youth extremism up - study

Intelligence and law agencies in the Western Five Eyes security alliance warned yesterday of a rising number of children being radicalised online by violent extremists.

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The intelligence-sharing group spanning the United States, Britain, Canada, Australia and New Zealand called for a "whole of society" response to the phenomenon in its first jointly authored public paper.

"We are increasingly concerned about the radicalisation of minors, and minors who support, plan or undertake terrorist activities," they said in the study.

The proportion of minors and people under 25 involved in such cases fluctuated over time, according to the study.