A 13-year-old Australian girl was threatened with arrest at a climate change protest outside the Prime Minister's home on Thursday, in an incident which has gone viral.

The demonstration outside Kirribilli House occurred as anger grows over the government’s handling of climate change amidst a bush fire crisis and nationwide heat wave.

The girl, known as Izzy, was there with her parents and cried after being confronted by the police. The incident was captured in a video by a journalism student.

Michael McCormack, the deputy prime minister, later confirmed that Mr Morrison is still out of the country, believed to be on holiday.

The record average maximum temperature of 40.9C degrees set on Tuesday was broken within 24 hours, with a national average of 41.9 recorded the next day.