Police are urging swimmers to be careful after two people were injured at Mermaid Pools in separate incidents on the weekend.
About 1pm on Saturday emergency services were called to the rock pools after a girl jumped from a rock ledge into the water, injuring her back.
The ledge was about 10 metres high.
The 17-year-old girl was assisted from the water and a significant emergency response was initiated.
Police from Camden Local Area Command, NSW Ambulance and Fire & Rescue NSW attended.
The victim was treated by NSW Ambulance paramedics before being winched out by helicopter and flown to Liverpool Hospital for treatment.
In the second incident, about 2.30pm on Sunday, a woman jumped from a rock ledge located about 20 metres above the water.
Upon impact, the woman sustained an injury to her lower back. She was assisted to the side of the pool by other swimmers and emergency services were contacted.
Police, with assistance from NSW Ambulance, and Fire & Rescue NSW, attended the scene and a rescue helicopter was requested.
After initial treatment, the 25-year-old woman was also extracted by helicopter and flown to Liverpool Hospital for treatment.
Police are concerned by the number of swimmers who have been injured after swimming at the pools despite the warnings and sign posts advising of the dangers of diving from rock ledges.
♦ Police are appealing for information following the armed hold up of a service station in Macquarie Fields last night.
Just before 10pm, a man armed with a knife entered the service station on Harold Road.
Police say he threatened the store employee before demanding cash, which the employee handed over, before activating the alarm.
The man fled the scene and ran south along Harold Street.
Officers attached to Campbelltown Local Area Command established a crime scene and commenced an investigation.
Following inquiries, police would like to speak to a man who might be able to assist with the investigation.
He is described as being of Pacific Islander/Maori appearance, 170-175cm tall, aged between 15-20, with a medium to solid build, dark complexion and dark hair.
He was last seen wearing black t-shirt with white logo, tan shorts, white socks, black shoes and a white shirt covering his face with sunglasses.