A fundraiser for fire services in New South Wales, Australia has raised more than A$20 million (£10.6m; $13m) in just 48 hours, as the state battles a bushfire crisis.

Australian comedian Celeste Barber launched the Facebook appeal on Friday, writing: "Please help any way you can. This is terrifying."

At least 24 people have died since the fires began in September.

Prime Minister Scott Morrison has called up 3,000 reserve troops to help.

In Canberra, the air quality has been ranked as the worst in the world, and residents have been told to avoid leaving their homes.

Australian airline Qantas has cancelled flights to and from the city for the remainder of Sunday.