WATCH: The moment a Sydney factory explodes

At least 100 firefighters have managed to stablise a massive factory fire in Sydney's south-west.

The huge inferno broke out at Revesby around 11 this morning.

7News understands the fire started an automotive business that uses highly flammable chemicals.

Drivers have been told to avoid the area as thick black smoke from the flames affects visibility.


Two people have been treated for smoke inhalation, and up to 100 people have been evacuated from two industrial structures as a result of the blaze.

A massive explosion at a Revesby factory, captured by the 7News chopper captures.
A massive explosion at a Revesby factory, captured by the 7News chopper captures.

Black smoke can be seen billowing from the hectare-long site and Fire & Rescue NSW has warned this could affect nearby Milperra Road.

Photo: FIRST ON 7NEWS
Photo: FIRST ON 7NEWS

Ambulance officers have set up a command post to support firefighters and evacuees.

Firefighters are battling a massive factory fire at Revesby in Sydney's south west. Photo: FIRST ON 7NEWS
Firefighters are battling a massive factory fire at Revesby in Sydney's south west. Photo: FIRST ON 7NEWS