The violent doctrine of extreme Islam is spreading in Canada through the foundation of mosques, Islamic centres and Islamic schools by wealthy Gulf state investors with radical goals, a controversial U.S. commentator is warning.

Ayaan Hirsi Ali, a former devout follower of the Muslim Brotherhood, best-selling author, ex-politician and now a fellow at Harvard University's JFK School of Government, was the final witness recently at the national security and defence committee, which is preparing a report on threats to national security.

"You should be looking out for the sprouting of mosques and Islamic centres. You should be looking out for the establishment of Islamic schools and anything that costs money," she said via a video link from Boston. "Countries like Saudi Arabia and the oil-wealthy Gulf countries that have absolutely everything that money can buy, yet many of them choose, for their philanthropy, radical Islamic goals, institutions, activities, jihad.

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