Bushfire backfire: Australian firefighters warn of ‘mega blaze’ as country faces another heatwave (VIDEOS)

Australian firefighters are warning about an impending "mega blaze" as efforts to tackle over 100 bushfires have backfired spectacularly, while the country prepares for its possible hottest day on record.

At least 20 houses have been razed and over 400,000 hectares burned as fire crews battle over 100 fires in New South Wales. Residents are bracing for even more extreme temperatures this coming week, as historically hot weather is forecast. 

Authorities attempted to take advantage of cooler temperatures to carry out "back burning," or deliberately setting small fires to remove vegetation ahead of the main bushfires and thus stop their spread, but the tactic appears to have failed, as crews lost control of the back burn and the flames spread beyond on containment lines, reaching as high as 70m-high (229 ft).

"In these drought conditions, whatever we try doesn't seem to be working," NSW Rural Fire Service deputy commissioner Rob Rogers said. 

The impending heat wave could lead to the hottest day in Australia's recorded history, exceeding the current 50.7C (123.26F) record set back in 1960. So far six people have died in the bushfires since September and more than 700 homes have been destroyed, while towns and cities have been choking on noxious smoke from the wildfires. Air quality in Sydney is now worse than Beijing and New Delhi.

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