The shocking moment fairground ride collapsed at top speed - injuring 20 people - has been captured on camera.
Eight children were among those hurt after the roof of the merry-go-round swing fell to the ground during operation this week.
Riders, sitting in swings which were held by the roof, crashed into the base of the ride and surrounding ground.
Screams from terror-stricken riders were heard by witnesses and in footage.
Bystanders dashed to pull the wounded out from under the collapsed flooring of the mangled ride in Orenburg, Russia.
But three of the riders, including a 10-year-old girl, are in a serious condition. Doctors are preparing to operate on the youngster, whose condition is described as "extremely grave".
A 27-year-old woman is also "grave".
At least 12 people have needed treatment in hospital in total while the further eight have escaped with minor injuries.
The fairground opened in Orenburg, which is in southwest Russia, just one week ago, reports claim.
The park’s director Timur Shogenov insisted prior to the accident his rides were safe.
“There is no need to worry,” he said.
“It is all safe. All rides are subject to state checks and technical certification.”
Speaking after the accident, a senior local official said: “We don't know yet what caused the accident.
“But already now it is clear that there are serious questions to those in charge of the safety of the rides.”
He said: ”What has happened is simply unacceptable.
“Health and safety of the citizens is our priority.
“Those responsible for what has happened should certainly be punished.
“All the families affected today will be helped in all matters."
Three children were injured in a similar accident at an attraction in Columbia in April. People were trapped in caged pods after the ride come away from its base in the ground.
