Counties Manukau CIB Detective Inspector Karen Bright said officers found a vehicle believed to be involved in the robbery and followed it.
"An occupant has discharged a firearm from the vehicle towards police.
"Fortunately, no police staff have been injured."
The Eagle helicopter monitored the vehicle's travel, Bright said.
The vehicle's tyres were successfully spiked but it continued on.
"The armed offenders squad followed the vehicle when it was brought to a stop on Landscape Rd in Papatoetoe.''
Bright said two people were now in custody.
The incident led to delays for two international and three domestic flights at Auckland Airport.