The serious crash unit is investigating the death of a 15-year-old boy, who died after falling off the back of a moving ute near Masterton on Tuesday.
The boy was helping a family friend move furniture and was on the back of the ute with some large items including a cabinet and a fridge.
Police say an extremely strong gust of wind knocked the teenager and all the furniture on the road.
They say the teenager suffered facial injuries and failed to regain consciousness despite efforts to revive him.
The incident happened at Te Ore Ore Bideford Road, about 20km from Masterton.