The incident was sparked about 10 minutes earlier when the driver of a hatchback “hard-braked” in front of the minivan on the Southern Motorway near the Mt Wellington Highway, Detective Senior Sergeant Martin Friend said.
“The driver of the hatchback has taken exception to the minivan and has begun to drive in an aggressive manner,” Friend said earlier.
Both cars continued driving citybound before exiting on to the Northwestern Motorway and then taking an exit at St Lukes Rd.
The rear window of the minivan was partially shattered and a bullet hole was visible. Five family members were inside, and they sought refuge at the Z petrol station on Sandringham and Balmoral Rds in St Lukes.
“We don’t know the calibre of the weapon, but it has gone through the vehicle and into the victim,” Friend said.
“Police are appalled at the reckless violence exhibited towards innocent members of the public.”
The girl was taken to Auckland City Hospital, where she remained in a stable condition as of print deadline.
One other person was moderately injured, but not by gunshots, Friend said.
“Our priority is to support the victim and bring charges in this matter.
“We are looking for anyone who saw the vehicle or witnessed subsequent shots fired,” he said.
“We are unsure at this stage which direction the offending vehicle left in.”
Yesterday afternoon, Friend revealed details of the vehicle: a grey 2009 Mazda Axela, registration NGL15.