A huge fire has broken out near the Qantas Terminal at Sydney Airport.

Fire authorities were called to a factory on Coward Street in Mascot at about 7pm on Tuesday after it went up in flames.

Commentary on social media from a CNN cameraman suggested the airport sent emergency crews to 'watch over their fuel storage' depots next to the tarmac after the blaze erupted.

Smoke filled the air on Tuesday night near the Sydney Airport

Fire authorities have rushed to put out a blaze at a warehouse on Coward Street in Mascot near the Sydney airport

But Sydney Airport said the fire is not near airport fuel depots.

Fire authorities have more than 18 crews on the ground made up of 70 firefighters rushing to put out the blaze at the two storey warehouse.

The fire started on the ground floor of the factory.

Smoke is seen billowing outside the airport precinct at Sydney from a nearby warehouse fire

Fire authorities were called to a factory on Coward Street in Mascot at about 7pm on Tuesday after it went up in flames

Fire and Rescue New South Wales confirmed the blaze was still contained to the warehouse complex at about 8.15pm.

New South Wales ambulance crews are on standby but no one is understood to have been injured.

Masses of smoke can be seen from as far away as Cremorne Point on Sydney's lower north shore and Manly on the Northern Beaches.

More than 70 fire fighters are battling a blaze near Sydney Airport at Mascot on Tuesday evening

Fire fighters were still battling the blaze at Mascot in Sydney after 8pm on Tuesday

Passenger planes continued to take off and land as smoke billowed from the blaze.

A spokesperson for the Sydney Airport said the fire is north of the airport precinct.

'We are anticipating minimal delays, less than 15 minutes as a result of the smoke,' he said.

Fire authorities brought aerial appliances onto the scene in an attempt to bring the blaze under control.

A Sydney Airport fire crew was also brought in to help Fire and Rescue crews, while New South Wales police and paramedics were on standby.

Firefighters use aerial appliances to battle the blaze in a large industrial building in Coward St, Mascot

Significant resources were allocated to bring the blaze under control at the Mascot warehouse on Tuesday night

Twitter users have been sharing images of the fire from all around Sydney as heavy smoke fills the air around Sydney

Fire and Rescue New South Wales confirmed the blaze was still contained to the warehouse complex at about 8.15pm