A teenage girl has gunshot wounds after the vehicle she was in was fired on during a road rage incident near St Lukes.
The incident started about 9.50pm on Tuesday when two vehicles, a hatchback and minivan, were travelling citybound on the southern motorway.
The driver of the hatchback took exception to the minivan and began to drive in an aggressive manner, Detective Senior Sergeant Martin Friend said.
The vehicles continued onto the north-western motorway, and left at St Lukes Road.
About 10pm a firearm was discharged toward the rear of the minivan, near the intersection with Asquith Avenue, hitting the teenager sitting in the back.
She sustained serious injuries as a result.
The minivan stopped at a petrol station on Sandringham Road where police were notified.
The teenager was taken to Auckland City Hospital where she was in a stable condition. She was not expected to require surgery, Friend said in a statement.
"Like our community, police are appalled at the reckless violence exhibited towards innocent members of the public in this incident.
"The community can be assured that police are taking this incident extremely seriously and our investigation team are working to hold those responsible to account."
Motorists travelling along the route who witnessed the initial incident are asked to contact police through the 105 phone service quoting the file number 230516/7840 or Crime Stoppers anonymously on 0800 555 111.