Visitors to an amusement park in Arkansas were left stunned this weekend after a roller coaster train carrying 12 riders came to a halt at the highest point of the loop due to a power outage. According to onlookers, the X-Coaster passengers were stranded upside down for nearly 30 minutes before they were rescued by firefighters.

According to park officials, the power outage might have been caused by a tree limb or an animal that might have got stuck in the system.

The crew from local Hot Springs Fire Department used ladder trucks to pluck the riders from the coaster.

The X-Coaster was added to the Magic Springs and Crystal Falls park last year. A single train with two cars takes 12 riders 150 feet above the ground level rolling down into a 360-degree corkscrew loop at 65 mph.