Eight children and two adults were hurt after a rollercoaster derailed and fell six metres onto a kiddies’ ride.
Two of the injured teenagers had been standing under the ride.
Visitors rushed to help those stuck in harnesses on the Tsunami rollercoaster – which reaches 65km/h – after a carriage went off the tracks at M&D’s theme park in Motherwell, Scotland, on Sunday.
Witnesses said it flew off the track at full speed and shot through a fence before hitting a concrete play area for toddlers.
Roselyn Rodger, 49, from Motherwell, said: “The carriage only narrowly missed a little kid who was riding a bike.”
Six ambulances were called and the park was evacuated.
A spokesman for M&D’s said the theme park was closed until further notice.
The Tsunami ride – which has a loop-the-loop and corkscrew – also malfunctioned in 2011, with nine people trapped in the air for eight hours.