A motorcyclist is dead after a crash at Kaipara Flats, north of Auckland, this afternoon.

Emergency services were called to the single-vehicle crash at Woodcocks Rd near Warkworth at about 12.35pm, police said.

The motorcyclist suffered serious injuries and died at the scene.

Diversions are in place at Woodcocks Rd and Old Kaipara Rd, and Woodcocks Rd and Carran Rd.

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Motorists are advised to avoid the area if possible.