Police and education chiefs today urged principals at more than 2200 government schools to call a dedicated hotline if they suspect extremist behaviour.

The memo headed "Advice for Principals -  Anti-social and extremist behaviours" was co-signed by Police deputy commissioner Catherine Burn and the deputy secretary of school operations and performance Gregory Prior.

It follows Premier Mike Baird's announcement of a sweeping audit of prayer groups across the state school system amid fears they have been infiltrated by Islamic State-inspired ideology.

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