A mystery fire has destroyed an expensive powerboat at Woodman Point, south of Fremantle.
Photos have been released of the blaze which firefighters estimate caused $100,000 damage.
The fire broke out just after 9am on Saturday as the boat was anchored at the Cockburn Powerboat Club in Jervoise Bay.
At one point 20 firefighters as well as Cockburn Volunteer Sea Rescue fought the fire.
But by 10am the fire was out and the boat was destroyed.