The police have found a suspected drug lab in the boot of a car in the Auckland suburb of Mount Roskill.
They said a cordon in place on Dominion Road between Mount Albert Road and Memorial Drive will be lifted shortly but drivers heading south on Dominion Road should expect delays.
Senior Sergeant Ian Chapman said the suspected lab was discovered during a routine vehicle stop.
"We're currently speaking to one person with respect to the vehicle and what was located in it.
"We're also utilising the New Zealand fire department who are currently at the scene and assisting with decontaminating the driver of the vehicle."
Mr Chapman said no businesses or households in the area needed to be evacuated.