A Muslim imam says he's been forced into hiding after voicing support for the ideas of anti-Islam campaigner Ayaan Hirsi Ali.

Mohammed Tawhidi, of the Islamic Association of South Australia, said he agrees with Ms Ali's call to close Islamic schools in Australia.

He has also rejected extremist groups.

Ms Ali cancelled her tour of Australia this week because of fears for her safety.

"These schools do exist that are a problem and they need to be either shut down or changed completely," Imam Tawhidi said.

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