Organisers of a steam fair where a young woman sustained potentially life-changing injuries to her head say they are working with authorities to establish what happened.
The 18-year-old was taken to hospital after the incident on a ride at the Netley Marsh Steam and Craft Show at about 22:50 BST on Saturday.
Netley Marsh Steam and Craft Show said it was “co-operating with all parties involved” following the “unfortunate incident”.
“No further comment will be made until such time as appropriate and more information is available,” it said in a statement on Sunday.
It said any other comments made on social media did not reflect organisers’ views and that it “will continue to support all parties involved”.
Hampshire and Isle of Wight Constabulary said officers were liaising with the Health and Safety Executive (HSE) at the weekend.
A woman, who told the BBC she helped administer first aid to the teenager, said there had been “shock and panic” at the scene.
The woman, who did not wish to be identified, said she had not initially realised the severity of what had happened.
“One of the girl’s friends came down and said how serious it was and some of us offered assistance.
“It’s very shocking it could happen on a fairground ride that young children go on. This must never happen again,” she said.
An HSE spokesperson said the incident was “local authority enforced and with Hampshire police”.