Six Flags Magic Mountain opened as usual Tuesday morning to park visitors amid a safety inspection into a roller coaster that stranded passengers mid-air for hours one day earlier.
The Ninja roller coaster became stuck Monday evening after a tree branch fell on the track, partly derailing the train and leaving 22 riders suspended about 40 feet above the ground for nearly three hours.
Cal/OSHA investigators determined the front car hit the tree with its front wheel. A tree branch then slammed onto the front right corner of the first car and also hit the sixth car. The cars traveled another 30 feet before coming to a stop.
The ride remained closed on Tuesday, but the park was open and welcomed visitors who seemed unfazed by what happened.
"I feel like if it was serious, they wouldn't let us back in," Berenice Rodriguez said.
Four of the 22 passengers were taken to the hospital for treatment as a precaution. They had all been treated and released by Tuesday morning, park officials said in a statement.
"The branch just fell on the ride," Magic Mountain guest Tifani Tucker said. "I'm not worried about it."
The park will have to consult with an arborist, and Cal/OSHA will look at clearance around the rides as part of a safety inspection.