Two men have been airlifted to hospital after a powerboat race in Weymouth.
Portland Coastguard says the accident happened during the final race of a national powerboat racing championship when a boat flipped over.
The Coastguard, The Dorset and Somerset Air Ambulance and police are all in attendance.
Organisers of the P1 SuperStock UK Championship have cancelled the race. They say a powerboat driver and navigator suffered serious injuries in the accident and have been flown to Southampton General.
The Marine Accident Investigation branch is investigating.