Respected Muslim community members fear a leadership vacuum in Australia has allowed radicalisation to flourish as young men turn to social media for spiritual guidance.

One week after schoolboy Farhad Jabar killed a police accountant, the country's most senior Muslim leader spoke publicly for the first time on Friday flanked by his translator and a group of faith leaders.

The Grand Mufti, Dr Ibrahim Abu Mohammed, refused to call the shooting at Parramatta police headquarters a terrorist act, despite Police Commissioner Andrew Scipione and Premier Mike Baird labelling it one.

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