A motorcyclist is in a critical condition and two others have been injured in a serious crash south of Auckland.

Police said they were attending the incident that happened on Ponga Rd, near Opaheke, at about 9am involving three motorcyclists.

One rider was in a critical condition and was being taken to hospital.

Two other riders received minor injuries in the crash.

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The Serious Crash Unit was attending the incident.

Ponga Rd would be closed near Opaheke for the next couple of hours.