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EUREKA, Mo. – Friday featured a rough roller coaster ride for some students on a field trip to Six Flags outside St. Louis.

FOX 2 reports that what started as a fun day at Six Flags turned into a frightful roller coaster ride, leaving some people in the hospital. A malfunction caused the “Boomerang” to stop abruptly right in the middle of the ride.

The park was closed at the time, but a group of students were there for a special field trip for getting good grades.

In all, four people were hurt, and taken to a hospital.

Park officials say they closed down the ride immediately, and will make sure it is inspected closely for any issues before re-opening.