A Muslim leader whose group planned to rally 5000 protesters outside a talk by anti-Islam activist Ayaan Hirsi Ali on the basis that she "condones violence and radicalises people" has previously met with a radical sheikh who promoted suicide bombing.

On Monday Ms Ali, a Somalian-born activist and refugee, cancelled her planned speaking tour of Australia and New Zealand, citing a "number of reasons including security concerns" and a "succession of organisational lapses" by event organisers.

She had been due to appear in Sydney on Saturday night.

Security agencies and police have reported no specific threat against Ms Ali.

Read the complete original version of this item...