(CNN) — Americans love roller coasters -- until something goes wrong.
Attention turned to amusement park safety after a tree branch that fell on the tracks derailed a roller coaster car at a Six Flags amusement park Monday evening, leaving it dangling precariously and its occupants stranded for hours.
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Four people were injured on the Ninja ride at Six Flags Magic Mountain, the Los Angeles County Fire Department said. Two of the four were taken to a hospital as a precautionary measure.
It was an amusement park enthusiast's nightmare. "It was just a lot of leaf noise and then cracking noises and crashing noises and a lot of screaming," Brandy Chambers, who witnessed the incident from her vantage point on another ride, told CNN affiliate KTLA.