A bulldozer has gone over a bank, in a remote part of Taranaki.

Police and ambulance were called to the scene at 4.20pm, near the Precision Helicopters head office on Kaipikari Rd near Urenui.

It's believed the bulldozer rolled after tipping over the bank, although there are conflicting reports that the vehicle was actually a quad bike.

One person has been injured in the incident, and was originally in a serious condition.

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They were taken to New Plymouth Base Hospital by helicopter, and their condition has since been downgraded to moderate.