Prince George’s County Fire officials were called to The Joker’s Jinx roller coaster just before 2:30 p.m. Sunday. No injuries have been reported.
Assistant Fire Chief Paul Gomez says the riders are sitting upright. He says it will likely take a few hours to get them down.
A Six Flags America spokesman said in a statement that it is not yet clear what caused the ride to stop but that it has a computerized safety system that “performed as it is designed to.”
Six Flags’ website says the ride goes 60 mph (96.5 kph) per hour and turns upside down four times.