The explosion blew a chemical tank into the air causing fire and concrete to rain down on hundreds of firefighters below. (Image: NSW Ambulance)

Firefighters are battling an inferno that has destroyed at least one building and has detonated a chemical tank at an industrial site in Sydney, Australia. New South Wales Fire said that the explosion saw "fist-sized" chunks of concrete and other debris rain down on first responders.

Pictures captured by NSW Ambulance officers show the moment the night sky went from black to bright orange as the fireball exploded over the western Sydney suburb of North St Mary's on Saturday (November 29). More than 200 firefighters are battling the blaze, which broke out just before 11pm local time.

Firefighters worked to establish numerous lines of

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