Massive police operation shuts down entire block after STRANGER threatens a woman with a gun in a parking lot - as residents are ordered to avoid the area

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Residents have been ordered to stay away from a building in western Sydney after a woman was threatened by a man with a gun, sparking a major police operation.

Officers were called to a unit block on Uhrig Road in Lidcombe about 7.20am on Tuesday.

Witnesses had reported that a man – armed with a handgun – threatened a woman in a multi-level car park. 

'The woman was shaken but not physically injured,' a NSW Police spokesperson said.

The man, who was not known to the woman, left in a white Subaru SUV, which officers said had cloned number plates.

Heavily armed police, including members of tactical units, have established a perimeter around the scene to carry out an extensive search.

'The public is urged to avoid the area while the operation continues,' the spokesperson said on Tuesday morning.

NSW Police Superintendent Robert Toynton told reporters on Tuesday that the man was still at large. 

'The information we've got thus far from our victim, but also from our CCTV analysis we've done this morning, is there was some type of disagreement in the car park,' he said. 

'That has then resulted in this incident (which) is completely unacceptable.

'If someone sights the Subaru SUV, and they believe it's involved in this, do not approach the vehicle. Contact Triple 0 immediately and ask for the police.'

Motorists have been warned Uhrig Road, Carter Street and Canning street are currently closed.

Anyone with information about the incident, or who may have relevant dashcam vision, has been urged tp contact Auburn Police or Crime Stoppers.