Couple recall ‘terrifying’ moment they were forced to help young girl after rollercoaster 'seatbelt came undone'

A couple have opened up about the 'terrifying' moment they held on to a girl after she reportedly realised her seatbelt wasn't working on a rollercoaster.

Chris and Cassie Evins heard the scream of a young girl when her seat allegedly came undone behind them at the Worlds of Fun park in Kansas City on 11 October.

“We get on the roller coaster and the very first hill, the girl sitting behind my wife just lets out this blood-curdling scream like I’ve never heard before,” Chris told KCTV.

“I assumed it was her first time on the ride and then she said my seatbelt came undone.”

The pair, who own season tickets to the theme park, were on board the Mamba roller coaster and were well aware of the ride's layout at the time.

Chris and Cassie Evins said they saved the girl's life (Worlds of Fun)

Managing to get ahold of the girl, Chris said: “I had looped my arm underneath her lap bar, which had a pretty big gap between her and the lap bar.

“So at this point, I’m seeing a huge space, no seatbelt. I looped my arm underneath the lap bar, and I grabbed a hold of her wrist.

“My wife was pushing down on her legs.”

The pair, who own season tickets to the theme park, said they were very familiar with the ride they were on (Facebook)

When the experienced rider realised she 'was going to lift out of her seat', he claims the couple shifted their positions accordingly to 'push down on her whole body to keep her from coming out of the seat while we’re going over those hills'.

“My whole thought after the incident is, what if it had been somebody else in our seats?” Chris added.

“What if it was others, her friends?

“You know, they could have had a drastically different outcome.”

A Worlds of Fun spokesperson said the ride was shut down immediately after the incident.

Chris and Cassie claim the girl's seatbelt became undone (Facebook)

A spokesman told the Daily Mail: "The safety of our guests and team members is a top priority. Following the report of a guest concern on the ride several weeks ago, our team immediately closed the ride and completed a thorough inspection before reopening it that evening.

"The ride is equipped with a multi-layered restraint system, with lap bars being the primary restraint.

"The seat belts serve as a secondary restraint.

"Throughout multiple inspections, there was no evidence of restraint failure in the lap bar system or the buckles on any seat belts during any of the ride inspections and the ride has operated safely since the initial concern was raised."