A leading world critic of Muslim extremism says New Zealand should establish "assimilation centres" for migrants and refugees from Muslim countries.

Somali-born Ayaan Hirsi Ali, a former Netherlands MP for the right-wing People's Party, has been under police protection since she made a film in 2004 about violence against women in some Muslim cultures.

The film's producer Theo van Gogh was murdered four months after the film's release and a letter pinned to his body with a knife threatened to kill Hirsi Ali too.

Hirsi Ali will speak at an event organised by Sydney-based promoters ThinkInc at the Bruce Mason Centre in Takapuna on April 9.

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