Two people on a slingshot ride at London’s Winter Wonderland were sent crashing into a metal beam after one of the bungee cords broke loose.
Video shows it breaking on take off and the capsule being hurled to the left instead of straight up.
The green metal cage collided with a supporting post and spun erratically, with the two riders left dangling.
It happened on Wednesday night and people on the ground can be heard gasping and swearing as the pod lurches out of control.
Another clip on social media shows people being ushered away.
“Both riders were safely escorted off the ride, checked by our on-site medics and were not injured,” a Winter Wonderland spokesperson said.
They said safety was the “highest priority” at the Hyde Park attraction and that all rides had “rigorous and regular” safety checks.
Read more on Sky News:
Rollercoaster crash at Legoland in Germany injures 31
Two children injured after rollercoaster breaks down at theme park
London Fire Brigade tweeted: “Firefighters were called to Winter Wonderland last night as two people were trapped inside a bungee carriage.
“They were freed by on-site staff and there was no action required by the Brigade.”
Winter Wonderland has become a regular attraction that pulls in big crowds to its fairground rides, markets and festive eateries.