One case that has researchers scratching their heads occured in the city of Mascot, where radar operators picked up several unknown objects. Two RAAF Mirage jets were put on high alert.
However, after a more in-depth investigation, it was determined that unidentified objects reported by Sydney were 'generated entirely by radar interference known colloquially as 'running rabbits'.
Though not resulting in anything 'out of this world, it does show that the Aussies regarded UFOs as a serious subject. See a detailed report at Secret UFO Files Released in Australia, and see what you think.