Controversial Islamist group Hizb ut-Tahrir has hit back at claims it may pose a security threat.

Perth-based think tank Future Directions International (FDI) says while Hizb ut-Tahrir does not advocate violence, its anti-Western rhetoric could pose a "socio-cultural" security threat by increasing the disharmony between Muslim and non-Muslim Australians.

In the long term, the group may pose a significant national security threat by indirectly instigating terrorist attacks, FDI warned in a study last week.

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