Two children have been injured in two crashes, in which both the drivers are still at large.
Four people were injured in total, when the vehicles crash in south Auckland on Friday.
Police say they are still trying to find the drivers of the vehicles involved in the crash.
One crash was a hit-and-run, where a 10-year-old boy and 13-year-old suffered minor injuries after being struck by a car on Artillery Rd, Papakura, at 5.40pm.
A police spokesperson says they were treated at the scene by ambulance staff, a police spokeswoman said.
"The driver did not stop at the scene and no registration number was obtained. We're not even sure if the driver realised they hit the kids."
The other accident happened at 4.45pm, when a stolen vehicle fled police and crashed into another vehicle on Russell Rd, Manurewa.
The police spokesperson says a female passenger from the fleeing car was seriously injured and the male driver from the other vehicle vehicle had moderate to serious injuries.
The driver of the stolen car fled on foot.
Witnesses of the first crash, or anyone who knows anything about the driver of the stolen car should call police on 09 261 1300, or Crimestoppers anonymously on 0800 555 111.