A sacked New South Wales principal of a majority Muslim high school allegedly planned to only allow Muslim students, some of whom declared themselves "Islamic State sympathisers".
Chris Griffiths, who converted to Islam in 2014, had come to the attention of authorities after complaints he'd been alienating non-Muslim staff at Punchbowl Boys High School, The Daily Telegraph reports.
It is the latest in a string of controversies surrounding the public school around 20km southwest of Sydney's CBD including fears of radicalisation.
Staff alleged students had threatened to behead non-Muslim teachers and declared themselves IS sympathisers, The Australian reports.
Female teachers were said to have been barred from participating in official events including the Year 12 graduation ceremony.
Police liaison officers had also not been allowed into the school for two-and-a-half years including prayer times, with the relationship becoming "actively hostile" - around the same time Mr Griffiths took over as principal.
It is normal for police to attend some schools and even prayer sessions.
None of the alleged incidents weren't reported to police.
Both Mr Griffiths and deputy principal Joumana Dennaoiu were sacked following an Education Department investigation prompted by complaints.
A law enforcement official told the Daily Telegraph "the view was that the principal was trying to turn it into an Islamic-only school".
There was also concern about Mr Griffiths' rhetoric, including reportedly referring to police as "pigs" and telling students that if they're stopped by officers to film them and not to do what they say.
Robert Patruno has been appointed as the school's new principal, along with a new deputy, Daily Mail Australia reports.
Under previous principal turned NSW MP, Jihad Dib, the school turned itself around from being riddled with gang affiliations to a high-performing school.