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'We're In For A Long Night': Communities Told To Brace For Volatile Fire Conditions

Communities across southeast Australia have sweltered through a high-danger day amid confirmation of more death and destruction in the ongoing bushfire crisis.

Two more people were confirmed dead on Saturday, this time in Kangaroo Island in South Australia, where a father and son were killed trying to return to their property after fighting a nearby blaze.

In Victoria, six people remain missing and more than a dozen fires are at emergency warning level as at 11pm on Saturday night.

In NSW, residents were warned to brace for volatile fire conditions through the night as a southerly change moved its way through the state, bringing with it winds of up to 80 kilometres an hour.

Heat records also tumbled in Canberra and Penrith in Sydney's west.

Image: Getty

In Tasmania police charged a 35-year-old man with lighting a bushfire in the state's northeast where a string of blazes have destroyed a home and burned more than 11,000 hectares.

In WA an uncontrolled bushfire burning since December 20 continues to block the road link to South Australia.

The ACT is shrouded in smoke from interstate bushfires.

Earlier on Saturday, Prime Minister Scott Morrison announced 3,000 army reserves would be called up over the coming weeks to assist fire-affected communities.

FOLLOW LATEST BUSHFIRE WARNINGS HERE:

Vic Emergency, Rural Fire Service, Tasmania Fire Service, WA Emergency, and South Australian Country Fire Service.

Detailed information on the RFS declared leave zones can be found here.

If you'd like to help, donations can be made to Salvation Army Disaster Appeal or Australian Red Cross.

To find your nearest evacuation centre, click here.

With AAP. 

Live updates on Saturday's bushfires have now ended. Catch up below. 

Coverage of the bushfires will resume on Sunday.