Several people were taken to St George Hospital after a three-car crash at Kurnell on Wednesday night.
Just after 10pm, emergency services were called to Captain Cook Drive near the Cronulla Waste Water Treatment Plant.
Four people and a child were treated and taken to hospital in a stable condition.
A female, 25, was treated for hip and right shoulder pain. Another male, 25, had facial lacerations and pain to his right arm.
A male driver and a child have since been discharged from hospital.