An investigation is underway into the accident at Oulton Broad which has left a woman and a seven-year-old girl in hospital.
The Broads Authority is investigating after four people were injured when a speedboat crashed into a stationary vehicle at Oulton Broad.
UK Coastguard were alerted to the incident after a member of the public made a 999 call at 11pm on 25 August.
Lowestoft and Southwold Coastguard Rescue Teams attended, along with the East of England Ambulance Service, Suffolk Police and the Suffolk Fire and Rescue Service.
A man, woman and two children were taken to the James Paget Hospital in Gorleston.
The woman and a girl, aged seven, remain in hospital, both in a serious but stable condition.
The woman has suffered a fractured back and skull.
The girl has been transferred to the Norfolk and Norwich University Hospital to receive treatment for forehead injuries.
Another girl, aged 10, and the man sustained minor injuries.
A spokesman for the Broads Authority said: “Broads Authority officers will be working with Suffolk Police, the Marine Accident Investigation Branch and the Marine and Coastguard Agency to investigate the collision.”
“We wish a full recovery to those involved.”
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