A man lost a finger and a tooth while tackling a teenager who he believed had stolen his motorcycle, police say.
The injured man, 22, is now in Wairarapa Hospital undergoing surgery.
The missing middle finger has not been recovered.
Police said the Masterton man noticed his 125cc Lifan Pit Bike missing from his South Belt address yesterday afternoon.
He went to Queen Elizabeth Park about 4.30pm, where he spotted a young man he knew riding it near the BMX track, Masterton police Senior Sergeant Carolyn Watson said.