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Six Flags Ninja Roller Coaster was derailed Monday after the roller coaster hit a tree branch at the Six Flags Magic Mountain amusement park. According to CNN, the front car of Six Flags Ninja Roller Coaster has been dislodged after the branch fell and left four people injured with minor injuries. Day turned to night as nearly two dozen roller coaster enthusiasts were also left suspended 20 to 30 feet in the air for hours due to the Six Flags Ninja Roller Coaster derailment.