Hazardous materials officers from Fire and Rescue NSW say they are concerned about possible asbestos contamination after a fire at a Rosehill gas plant this morning.
Roads were closed off around the factory where liquefied petroleum gas bottles are re-filled after the fire.
Parramatta fire fighter Bob Callow said the fire had been contained to an area away from the LPG storage and there had been no explosions.
Mr Callow said hazardous materials officers from Fire and Rescue NSW were working at the site to clear up contamination for burnt materials.
Initial reports were that the fire had started in a painting booth, he said. But investigators later said a full report into the cause of the blaze would not be ready until the end of week.
Police said emergency services were called to the Grand Avenue factory after an employee reported a fire inside the building about 5.40am this morning.
Fire crews from Parramatta and Silverwater attended the emergency.
The Grand Avenue has been closed to traffic at James Ruse Drive.
Access to the industrial area bounded by Grand Avenue, Unwin Street and Colquhoun Street has been restricted.
Police advised drivers to take care driving along James Ruse Drive as it may be affected by drifting smoke.
Anyone with information about this incident should call Crime Stoppers on 1800 333 000.