India, Aug. 27 -- Two women needed emergency brain surgery within six days of riding Six Flags Magic Mountain's X2 roller coaster. The incidents have raised fresh questions about the safety of the ride. X2 has been closed since July 12. The roller coaster is located at Six Flags Magic Mountain in Valencia, California.

Six Flags has not explained why X2 was closed. The company has only said that "the ride remains closed at this time." California regulators are still inspecting the ride.

State officials have not yet announced when the inspection will be completed or when X2 could reopen, according to a CNN investigation. X2 is one of the park's best-known roller coasters. The ride has seats that rotate 360 degrees while the train travels ...