POLICE have appealed for any witnesses to an incident in which two men allegedly impersonated police officers in Sydney’s south west this morning.

The two men were driving a dark-coloured sedan which had flashing blue and red lights in the dash.

A 22-year-old female driver was pulled over by an unmarked car about 1.15 this morning after turning off South Liverpool Road at Sadleir and into Sadleir Avenue when she notice the car with flashing lights behind her.

Believing it was a police car she pulled over to the side of the road and the car with the flashing lights pulled in behind her.

The woman waited inside the car for a few minutes before a passenger in the other car approached her while the driver of the fake police car waited inside.

It was then that the woman became concerned about the behaviour of the men and she drove off.

The two men followed before she lost sight of them and contacted police.

Police would like to speak to a man of Mediterranean/Middle Eastern appearance, 20-25 years old with a full beard who was last seen wearing a white T-shirt and a black baseball cap.

Inspector Ken Hardy said the woman became suspicious that the car that she stopped for had flashing lights but no sirens.

He said the woman did the right thing by driving off and reporting the incident.

Insp Hardy said all officers carried identification and members of the public should always ask to see it if they had concerns.

“The first thing is the uniform. If they are not wearing uniform then ask for ID. All police officers will produce it,” he said.

“It’s not very common (police impersonators), but it certainly is concerning and gives us a bad name.”

Most officers will also be wearing a firearm whether they are in uniform or not.

Insp Hardy said fake police uniforms could be purchased from fancy dress stores but it was not hard to tell the difference with a real uniform, including the officer’s name tag.

Anyone with information is urged to call Crime Stoppers on 1800 333 000.