Eight individuals were trapped upside down on a roller coaster at a Wisconsin festival, some of them for more than three hours.
State officials are looking into how this happened.
Around 1:30 pm, the roller coaster’s vehicles stopped close to the top of a loop.
the Crandon International Offroad Raceway on Sunday.
Eight passengers were discovered hanging upside down from their safety straps by the time the rescue crews arrived.
According to the Crandon Fire Department, firefighters reached them using ladder trucks and secured each one before releasing their over-the-shoulder safety bars.
To get all the passengers down, it took almost three and a half hours. A hospital was visited by one patient.
The fire brigade was informed by a ride operator that something mechanically malfunctioned on the state-inspected coaster.
In Wisconsin, the state Department of Safety and Professional Services is in charge of inspecting rides and reviewing amusement park designs.
According to agency spokesman John Beard in an email, an inspector was sent to the scene in Crandon, a town of roughly 1,700 people northwest of Green Bay, on Monday to conduct an investigation.
He knew nothing more about potential discoveries.