The Australian branch of the political group Hizb ut-Tahrir has denied any involvement in Saturday's riot in Sydney, but declined to join the many other Muslim groups condemning the actions of violent protesters.

The Opposition Leader, Tony Abbott, accused the group of nurturing "preachers of hate" and said the federal government should revoke the visa of Taji Mustafa, a British activist and speaker who addressed the Hizb ut-Tahrir group's annual conference in Bankstown yesterday.

In a speech in Sydney on Friday, Mr Mustafa said Australian Muslims should be "peaceful" in their protests against the YouTube clip that derided Islamic beliefs, but also said they should "kick out" the US ambassador.

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