Witnesses describe terrifying roller coaster crash in Scotland

Investigators in Scotland want to know what caused the violent crash of a roller coaster at a theme park in the town of Motherwell in North Lanarkshire, Scotland.

Witnesses described hearing the initial sounds of screaming children. But they could tell there weren't the normal yells you'd expect from passengers on a thrill ride - this was something far more menacing, reports CBS News correspondent Don Dahler.

A witness took a video moments after the roller coaster carrying nine people derailed and flew off the tracks in Scotland Sunday.

"I just turn around and you seen it like, not in slow motion but in fast motion it just plunged down to the ground and you heard the crash you heard the screaming and the fear of people," said the witness, Roselyn Rogger.

Images from the scene show bystanders rushing to help kids trapped upside down following the crash. At least 10 people were injured, including eight children.

"Our thoughts are with the families and those who were injured and our priority just is to make sure they are careful," said Scotland Police Chief Inspector David Bruce.

Police say five cars on the Tsunami rollercoaster at M&D's theme park detached from the rails as it rounded a curved portion of the track. The cars hit the side of the structure before plummeting 20 feet to the ground.

The Tsunami reaches speeds of up to 40 miles per hour and is Scotland's only inverted rollercoaster, where riders hang below the rails.

This isn't the first time the ride has experienced trouble. In 2011, a broken lift chain stranded passengers for eight hours.

"I feel sorry for the people that was involved. My heart goes out to every one of them," Rogger said.