Each occasion a blue hatchback sporting red P-plates has been put at the scene.

Mid-North Coast Local Area Command crime manager Detective Inspector Steve Clarke said he was concerned at the reports and police were working hard to locate the vehicle of interest and its driver.

"There is a reason for concern at these reports," Det Insp Clarke said.

"We are asking all parents and residents to stay vigilant and keep an eye on children in the area."

Det Insp Clarke said the latest incident occurred  on Wednesday at Lake Cathie -  it is the third such event in the area this month.

Previously on January 8, two girls were walking along Kew Road when they saw a car parked adjacent to a block of units.

A man sitting inside the driver's seat of the vehicle called out to one of the girls, a 16-year-old, offering her an amount of cash to get into his car. 

When she declined, he drove off in an unknown direction.

On Tuesday earlier this week another 16-year-old girl was involved.

The teenager was riding a skateboard along Abel Tasman Drive when the vehicle in question stopped a short distance from her.

Police said the driver tried to coax the girl into the vehicle but she fled the scene.

Police are still conducting investigations into the Wednesday incident which happened in Lake Cathie.

Det Insp Clarke warned youngsters in the area to also be aware of the situation and offered advice if caught in a similar circumstance.

* Do not approach the vehicle

* Do not speak to anyone you do not know

* Turn around and walk away immediately and go straight to a safe place

* Observe as much detail as safely possible to assist police with the investigation

* He even asked residents who spot anything suspicious to use their phone's and take a photo.

"Any information will help us," he said.

Anyone with information about this incident should contact Port Macquarie Detectives via Crime Stoppers on 1800 333 000.

Other tips;

-* Make sure your parents or another adult you know knows where you are at all times.

* Always walk straight home or to the place you are walking to. Walk near busier roads and streets, or use paths where there are lots of other people.

* Know where safe places are - a shop, service station, police station, library or school. If you are ever frightened, you should go to one of these places and ask them to call the police.

* Learn about safe adults you can look for and talk to if you need help - police officers, teachers at school, adults you know and trust.

* Don't talk to people you don't know and never get into a car with someone you don't know. If a car stops on the side of the road and you don't know the person inside, do not stop.

* If you are scared and can use a phone, call 000 and tell them you are scared.

*  If someone tries to grab you, yell out, 'Go away, I don't know you'. This lets other people know you have been approached by someone you don't know.