More mosques should be built to stop young Muslims becoming radicalised, Australia's Grand Mufti has warned.

Islamic youths are increasingly turning to backyard prayer halls and "mini mosques" where self-styled imams are teaching extreme doctrine because there are not enough traditional centres, Dr Ibrahim Abu Mohamed said.

The frequent rejection of building applications not only meant the number of mosques can't keep pace with the growing needs of the faith but also led to increasing isolation and anger among Muslims, who felt they were being rejected.

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