A recreational boat was destroyed in a blaze at Wanganui Girls' College on Saturday. The carport the boat was parked in was partially damaged in the fire, which authorities are treating as suspicious.

Whanganui Fire Service sent two appliances to the Anzac Pde address soon after 1pm and brought the fire under control.

Yesterday a Fire Services spokesman said their specialist staff and Whanganui Police were investigating the fire.