A person has received serious injuries in a workplace incident near Whanganui.

Police were called to a vehicle accident on a private property on Kaiwhaiki Rd about 8am, a police spokeswoman said.

St John also attended, sending one ambulance and a helicopter from Palmerston North.

"One patient in a serious condition was transported to Whanganui Hospital by road ambulance," a St John spokeswoman said.

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WorkSafe has been notified of an incident on a farm involving a side-by-side vehicle, a spokeswoman said.

"We are making initial inquiries to establish what our next steps might be," she said.