All the fires were suspicious, said Garry Nielson, station officer at Masterton Fire station.
Crashes
As well as the fatal accident of a 17-year-old Pahiatua boy on Mt Bruce on Sunday morning, there was a series of minor crashes during the weekend.
A car and a truck collided at Gordon St and Te Ore Ore Rd on Friday morning.
Nobody was injured.
On Saturday night, the driver of a car crashed into a paddock on Chester Rd near Carterton.
There was another crash in Eketahuna on SH2 about 2am on Sunday morning leaving the occupants with minor injuries.