A witness at a Welsh theme park says screams were heard and rollercoaster carriages appeared "loose" in an incident that injured a man.
Oakwood Theme Park, in Pembrokeshire, remains closed following the accident on its Treetops ride on Sunday.
Dr Harriet Lloyd, from Carmarthen, was waiting for her husband and son, who were on the ride during the incident.
She said people on the ride "started screaming and saying stop" before a man was thrown to the ground.