'Fire-nados' blaze across US in searing hot heat

A mix of tornado winds are fire burning out of control in southern California has given rise to phenomenon US media outlets have dubbed 'fire-nados'.

One blaze, in the city of San Marcos, has burned over 700 acres and is being made worse by high temperatures.

Firefighters are gaining ground on a number of other fires in the region. A total of nine different blazes are forcing the evacuation of tens of thousands of people as the air quality drops due to the smoke wafting over the area.

Read: State of emergency declared in San Diego after wild fires

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State of emergency declared in San Diego after wild fires

Wild fires have forced authorities to declare a state of emergency in the Californian city of San Diego.