Hutt Valley police are investigating after a Trentham gun club was deliberately set alight last week.
Acting Senior Sergeant Richard Orr said three youths were spotted at the Heretaunga Pistol Club off Alexander Road on June 4 after the fire was lit.
Police investigations have uncovered the blaze started at about 5.45pm that day.
Graffiti has also been found on the walls of the club which was done prior to the fire.