A Muslim preacher who said homosexuality was 'unnatural' and gays needed to be 'treated' has been barred from speaking at an event for the Islamic Society at the University of Hertfordshire today.

Sheikh Assim Al-Hakeem had been invited by the University of Hertfordshire Student Union Islamic Society to speak on 'Marriage in Islam' at today's event but will now not be allowed onto the campus.

Student Rights, a watchdog group tackling extremism on university campuses, drew the university's attention to Al-Hakeem's statements about gays.

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