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EUREKA, MO (KTVI) – Four people suffered minor injuries after a roller coaster at Six Flags St. Louis stopped mid-ride.

It happened on the Boomerang roller coaster Friday around 11:30 a.m.

Six Flags is not yet open to the general public on weekdays.  Students were most likely there for one of two events.  Elementary, Middle School and High School Choirs were at the park for a music festival. Other students were at the park for, “Outdoor Classroom Days.”  They were given access to rides, games, and the  Palace Gardens Area.

Six Flags St. Louis released the following statement:

Boomerang did not complete its normal ride cycle causing it to stop at a mid-point location where all guests safely exited the ride. Our First Aid staff responded immediately and four guests were transported to a local medical facility as a precautionary measure. The safety of our guests is our top priority and the ride will be closed for a thorough inspection before re-opening.

On its website, Boomerang is described as “gravity defying”. The coaster pulls its riders backward up to the top of the 125-foot tall lift hill then releases them along 1,650-feet of twisted steel track at speeds up to 50 miles per hour.