Speculation is rife supporters of controversial Dutch politician Geert Wilders have been told to meet in the Perth CBD this afternoon, before being taken on a bus ride to a secret location.

Mr Wilders is expected to launch the anti-Islam Australian Liberty Alliance political party on Tuesday night in Perth, but the location has been kept a secret to avoid protesters.

The party plans to unveil its Senate candidates for the next federal election at the event, which is being held at a top-secret location amid security concerns.

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