Mourners were told they were "not welcome" by a cleric at a former policeman's funeral because they were non-Muslims.
The family of Erdinc Ozen, a former police officer and member of the navy reserves, are demanding an apology following the incident at Sydney's Auburn Gallipoli Mosque last month.
Mr Ozen, a Turkish-born Australian who served as a policeman until 2011, died from a brain aneurysm last month.