ANU's student newspaper, the Woroni, published a satirical cartoon about Islam, one in a series of similar cartoons that had already been published about Catholicism, Scientology, Mormonism, and Judaism. The cartoon can be found here. Of these five groups, apparently only Islam had adherents that couldn't handle the rather gentle satire in the cartoon, and complained to the Vice-Chancellor's office.
The Vice-Chancellor, Ian Young, took the most heavy-handed route possible, threatening the students unless the cartoon was removed. His rationale was a textbook example of the heckler's veto, in which speech is restricted because of the claimed potential for inducing violent behavior in others.
The Woroni issued a statement in which more details can be found about the incident.
This kind of censorship is utterly reprehensible in my view. No sensible or reasonable person could see that cartoon and believe it was over-the-top. I urge everyone to write Ian Young directly to let him know your view of his authoritarian and irresponsible action, and join the boycott of ANU.