Police say there was no pursuit of a speeding motorcyclist before a crash that critically injured a person.
They say a stationary police vehicle spotted the motorcyclist on the south-western motorway just before midday, but lost sight of it.
A short time later, another patrol car saw it on Mt Albert Rd near Dominion Rd and did a u-turn but also lost sight of it.
The motorbike and a vehicle crashed further along Mt Albert Road.
The police say at no point did officers signal to the rider to pull over and there was no pursuit.